<?xml version="1.0" encoding="UTF-8"?>
<!-- Prepared by IBM Cognos Disclosure Management XBRL Version: 10.2.3 Using Fujitsu -->
<!-- Validation status: Passed -->
<linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/instance http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
    <roleRef roleURI="http://www.comcast.com/role/CommitmentsAndContingenciesMinimumAnnualCommitmentsUnderTheProgrammingLicenseAgreementsAndOperatingLeasesDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureCommitmentsAndContingenciesMinimumAnnualCommitmentsUnderTheProgrammingLicenseAgreementsAndOperatingLeasesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedBalanceSheetParenthetical" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatedBalanceSheetParenthetical" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedFinancialStatements" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatedFinancialStatements" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfChangesInEquity" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_StatementCondensedConsolidatedStatementOfChangesInEquity" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfComprehensiveIncome" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatedStatementOfComprehensiveIncome" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfComprehensiveIncomeParenthetical" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_StatementCondensedConsolidatedStatementOfComprehensiveIncomeParenthetical" />
    <roleRef roleURI="http://www.comcast.com/role/CondensedConsolidatedStatementOfIncomeNBCUniversal" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatedStatementOfIncomeNBCUniversal" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureAccountingPolicies" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureAccountingPolicies" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureAccountingPoliciesNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureAccountingPoliciesPolicy" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_AccountingPoliciesPolicy" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureBusinessAndBasisOfPresentationDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_BusinessAndBasisOfPresentationDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCommitmentsAndContingencies" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureCommitmentsAndContingencies" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureCommitmentsAndContingenciesNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesRentalExpenseDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureCommitmentsAndContingenciesRentalExpenseDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureCommitmentsAndContingenciesTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatingFinancialInformationNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquity" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureEquity" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquityChangesInCommonStockDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureEquityChangesInCommonStockDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquityComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureEquityComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquityNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_EquityNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureEquityTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureEquityTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFairValueDisclosureRollforwardDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_FairValueDisclosureRollforwardDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFairValueMeasurements" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureFairValueMeasurements" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFairValueMeasurementsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_FairValueMeasurementsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFairValueMeasurementsTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureFairValueMeasurementsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFilmAndTelevisionCosts" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureFilmAndTelevisionCosts" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsFilmAndTelevisionCostsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_FilmAndTelevisionCostsFilmAndTelevisionCostsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureFilmAndTelevisionCostsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureFilmAndTelevisionCostsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegment" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureFinancialDataByBusinessSegment" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegmentDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_FinancialDataByBusinessSegmentDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegmentTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_FinancialDataByBusinessSegmentTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureGoodwillAndIntangibleAssets" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureGoodwillAndIntangibleAssets" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureGoodwillAndIntangibleAssetsIntangibleAssetsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureGoodwillAndIntangibleAssetsIntangibleAssetsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureGoodwillAndOtherIntangibleAssetsAmortizationOfIntangibleAssetsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureGoodwillAndOtherIntangibleAssetsAmortizationOfIntangibleAssetsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureGoodwillRollforwardDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureGoodwillRollforwardDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureGoodwillTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureGoodwillTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxes" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureIncomeTaxes" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesComponentsOfIncomeTaxExpenseDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureIncomeTaxesComponentsOfIncomeTaxExpenseDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesComponentsOfNetDeferredTaxLiabilityDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureIncomeTaxesComponentsOfNetDeferredTaxLiabilityDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesFederalStatutoryDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureIncomeTaxesFederalStatutoryDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureIncomeTaxesNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureIncomeTaxesTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureIncomeTaxesTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestments" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_Investments" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsCostMethodInvestmentsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_InvestmentsCostMethodInvestmentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_InvestmentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsEquityMethodInvestmentsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_InvestmentsEquityMethodInvestmentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsEquityMethodInvestmentsSummarizedFinancialInformationDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureInvestmentsEquityMethodInvestmentsSummarizedFinancialInformationDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsFairValueMethodInvestmentsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_InvestmentsFairValueMethodInvestmentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsInvestmentIncomeLossNetDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureInvestmentsInvestmentIncomeLossNetDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureInvestmentsTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureInvestmentsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebt" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_LongTermDebt" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebtCommercialPaperProgramDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_LongTermDebtCommercialPaperProgramDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebtDebtMaturitiesDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_LongTermDebtDebtMaturitiesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebtDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_LongTermDebtDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebtRevolvingCreditFacilityDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureLongTermDebtRevolvingCreditFacilityDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureLongTermDebtTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureLongTermDebtTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureNoncontrollingInterests" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_NoncontrollingInterests" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureNoncontrollingInterestsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureNoncontrollingInterestsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureNoncontrollingInterestsTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureNoncontrollingInterestsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefits" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefits" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsComponentsOfBenefitsExpenseDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefitsComponentsOfBenefitsExpenseDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsDeferredCompensationPlansDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefitsDeferredCompensationPlansDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsExpectedFutureBenefitPaymentsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefitsExpectedFutureBenefitPaymentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsInformationOnOurPensionBenefitPlansDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_PensionPlansAndPostretirementBenefitsInformationOnOurPensionBenefitPlansDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePensionPlansAndPostretirementBenefitsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePostretirementPensionAndOtherEmployeeBenefitPlansTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePostretirementPensionAndOtherEmployeeBenefitPlansTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePropertyAndEquipment" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePropertyAndEquipment" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePropertyAndEquipmentDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePropertyAndEquipmentDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosurePropertyAndEquipmentTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosurePropertyAndEquipmentTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureQuarterlyFinancialInformation" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureQuarterlyFinancialInformation" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureReceivablesMonetization" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureReceivablesMonetization" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureRelatedPartyTransactions" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureRelatedPartyTransactions" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsConsolidatedBalanceSheetDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_RelatedPartyTransactionsConsolidatedBalanceSheetDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsConsolidatedStatementOfIncomeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureRelatedPartyTransactionsConsolidatedStatementOfIncomeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_RelatedPartyTransactionsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureRelatedPartyTransactionsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccounts" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureScheduleIIValuationAndQualifyingAccounts" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_ScheduleIIValuationAndQualifyingAccountsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureScheduleIIValuationAndQualifyingAccountsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensation" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_ShareBasedCompensation" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_ShareBasedCompensationNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationRestrictedShareUnitsAndStockOptionFairValueDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureShareBasedCompensationRestrictedShareUnitsAndStockOptionFairValueDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationStockOptionsAndRestrictedShareUnitsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureShareBasedCompensationStockOptionsAndRestrictedShareUnitsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureShareBasedCompensationTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureShareBasedCompensationTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSignificantTransactions" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureSignificantTransactions" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSignificantTransactionsNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_SignificantTransactionsNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSignificantTransactionsTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureSignificantTransactionsTables" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSubsequentEvents" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureSubsequentEvents" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformation" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureSupplementalFinancialInformation" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureSupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationNetCashProvidedByOperatingActivitiesDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_SupplementalFinancialInformationNetCashProvidedByOperatingActivitiesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_SupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationReceivablesDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureSupplementalFinancialInformationReceivablesDetails" />
    <roleRef roleURI="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationTables" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureSupplementalFinancialInformationTables" />
    <roleRef roleURI="http://www.comcast.com/role/DocumentDocumentAndEntityInformation" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DocumentAndEntityInformation" />
    <roleRef roleURI="http://www.comcast.com/role/LongtermDebtDebtRepaymentsDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_LongtermDebtDebtRepaymentsDetails" />
    <roleRef roleURI="http://www.comcast.com/role/LongTermDebtNarrativeDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_LongTermDebtNarrativeDetails" />
    <roleRef roleURI="http://www.comcast.com/role/RecentAccountingPronouncements" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_RecentAccountingPronouncements" />
    <roleRef roleURI="http://www.comcast.com/role/StatementCondensedConsolidatedBalanceSheet" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatedBalanceSheet" />
    <roleRef roleURI="http://www.comcast.com/role/StatementCondensedConsolidatedStatementOfCashFlows" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_StatementCondensedConsolidatedStatementOfCashFlows" />
    <roleRef roleURI="http://www.comcast.com/role/StatementCondensedConsolidatedStatementOfIncome" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_CondensedConsolidatedStatementOfIncome" />
    <roleRef roleURI="http://www.comcast.com/role/SupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="cmcsa-20150331.xsd#ELRID_DisclosureSupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
    <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/StatementCondensedConsolidatedBalanceSheet">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_205" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_206" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_205" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_206" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_209" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_209" xlink:to="Locator_us-gaap_ClassOfStockDomain_210" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_211" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_212" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_211" xlink:to="Locator_us-gaap_CommonClassAMember_212" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_215" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_216" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_215" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_216" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_213" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_214" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_213" xlink:to="Locator_us-gaap_CommonClassBMember_214" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_207" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_208" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_207" xlink:to="Locator_dei_LegalEntityAxis_208" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_217" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_218" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_217" xlink:to="Locator_dei_EntityDomain_218" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_219" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_220" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_219" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_220" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_221" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="Locator_us-gaap_AssetsAbstract_222" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_221" xlink:to="Locator_us-gaap_AssetsAbstract_222" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="Locator_us-gaap_AssetsAbstract_223" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_224" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsAbstract_223" xlink:to="Locator_us-gaap_AssetsCurrentAbstract_224" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_225" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_226" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_225" xlink:to="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_226" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_227" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="Locator_us-gaap_ShortTermInvestments_228" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_227" xlink:to="Locator_us-gaap_ShortTermInvestments_228" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_229" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetCurrent_230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_229" xlink:to="Locator_us-gaap_AccountsReceivableNetCurrent_230" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_231" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NotesReceivableFromParent" xlink:label="Locator_cmcsa_NotesReceivableFromParent_232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_231" xlink:to="Locator_cmcsa_NotesReceivableFromParent_232" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_233" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingRightsCurrent" xlink:label="Locator_cmcsa_ProgrammingRightsCurrent_234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_233" xlink:to="Locator_cmcsa_ProgrammingRightsCurrent_234" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_235" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="Locator_us-gaap_OtherAssetsCurrent_236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_235" xlink:to="Locator_us-gaap_OtherAssetsCurrent_236" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_237" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="Locator_us-gaap_DeferredTaxAssetsNetCurrent_238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_237" xlink:to="Locator_us-gaap_DeferredTaxAssetsNetCurrent_238" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_239" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="Locator_us-gaap_AssetsCurrent_240" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_239" xlink:to="Locator_us-gaap_AssetsCurrent_240" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_241" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCosts" xlink:label="Locator_cmcsa_FilmAndTelevisionCosts_242" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_241" xlink:to="Locator_cmcsa_FilmAndTelevisionCosts_242" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_243" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="Locator_us-gaap_LongTermInvestments_244" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_243" xlink:to="Locator_us-gaap_LongTermInvestments_244" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_245" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentNet_246" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_245" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentNet_246" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_247" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IndefiniteLivedFranchiseRights" xlink:label="Locator_us-gaap_IndefiniteLivedFranchiseRights_248" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_247" xlink:to="Locator_us-gaap_IndefiniteLivedFranchiseRights_248" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_249" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Goodwill" xlink:label="Locator_us-gaap_Goodwill_250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_249" xlink:to="Locator_us-gaap_Goodwill_250" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_251" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="Locator_us-gaap_IntangibleAssetsNetExcludingGoodwill_252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_251" xlink:to="Locator_us-gaap_IntangibleAssetsNetExcludingGoodwill_252" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_253" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherIntangibleAssetsNet" xlink:label="Locator_us-gaap_OtherIntangibleAssetsNet_254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_253" xlink:to="Locator_us-gaap_OtherIntangibleAssetsNet_254" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_255" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="Locator_us-gaap_OtherAssetsNoncurrent_256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_255" xlink:to="Locator_us-gaap_OtherAssetsNoncurrent_256" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="Locator_us-gaap_AssetsCurrentAbstract_257" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Assets" xlink:label="Locator_us-gaap_Assets_258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AssetsCurrentAbstract_257" xlink:to="Locator_us-gaap_Assets_258" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_259" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_259" xlink:to="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_260" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_261" xlink:to="Locator_us-gaap_LiabilitiesCurrentAbstract_262" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_263" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="Locator_us-gaap_AccountsPayableCurrent_264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_263" xlink:to="Locator_us-gaap_AccountsPayableCurrent_264" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_265" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AccruedParticipationsAndResidualsCurrent" xlink:label="Locator_cmcsa_AccruedParticipationsAndResidualsCurrent_266" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_265" xlink:to="Locator_cmcsa_AccruedParticipationsAndResidualsCurrent_266" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_267" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedSalariesCurrent" xlink:label="Locator_us-gaap_AccruedSalariesCurrent_268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_267" xlink:to="Locator_us-gaap_AccruedSalariesCurrent_268" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_269" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgramObligations" xlink:label="Locator_cmcsa_ProgramObligations_270" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_269" xlink:to="Locator_cmcsa_ProgramObligations_270" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_271" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="Locator_us-gaap_DeferredRevenueCurrent_272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_271" xlink:to="Locator_us-gaap_DeferredRevenueCurrent_272" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_273" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="Locator_us-gaap_AccruedLiabilitiesCurrent_274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_273" xlink:to="Locator_us-gaap_AccruedLiabilitiesCurrent_274" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_275" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NotePayableToParent" xlink:label="Locator_cmcsa_NotePayableToParent_276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_275" xlink:to="Locator_cmcsa_NotePayableToParent_276" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_277" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtCurrent" xlink:label="Locator_us-gaap_DebtCurrent_278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_277" xlink:to="Locator_us-gaap_DebtCurrent_278" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="Locator_us-gaap_LiabilitiesCurrentAbstract_279" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="Locator_us-gaap_LiabilitiesCurrent_280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesCurrentAbstract_279" xlink:to="Locator_us-gaap_LiabilitiesCurrent_280" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_281" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="Locator_us-gaap_LongTermDebtAndCapitalLeaseObligations_282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_281" xlink:to="Locator_us-gaap_LongTermDebtAndCapitalLeaseObligations_282" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_283" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AccruedParticipationsResidualsAndProgramObligationsNoncurrent" xlink:label="Locator_cmcsa_AccruedParticipationsResidualsAndProgramObligationsNoncurrent_284" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_283" xlink:to="Locator_cmcsa_AccruedParticipationsResidualsAndProgramObligationsNoncurrent_284" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_285" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_DeferredTaxLiabilitiesNoncurrent_286" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_285" xlink:to="Locator_us-gaap_DeferredTaxLiabilitiesNoncurrent_286" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_287" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredRevenueNoncurrent" xlink:label="Locator_us-gaap_DeferredRevenueNoncurrent_288" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_287" xlink:to="Locator_us-gaap_DeferredRevenueNoncurrent_288" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_289" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_OtherLiabilitiesNoncurrent_290" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_289" xlink:to="Locator_us-gaap_OtherLiabilitiesNoncurrent_290" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_291" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="Locator_us-gaap_CommitmentsAndContingencies_292" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_291" xlink:to="Locator_us-gaap_CommitmentsAndContingencies_292" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_293" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_294" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_293" xlink:to="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_294" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_295" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount" xlink:label="Locator_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_295" xlink:to="Locator_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_296" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_297" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TemporaryEquityCarryingAmountAttributableToRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_TemporaryEquityCarryingAmountAttributableToRedeemableSubsidiaryPreferredStock_298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_297" xlink:to="Locator_cmcsa_TemporaryEquityCarryingAmountAttributableToRedeemableSubsidiaryPreferredStock_298" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_299" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_299" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_300" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_301" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="Locator_us-gaap_PreferredStockValue_302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_301" xlink:to="Locator_us-gaap_PreferredStockValue_302" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_303" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MembersCapital" xlink:label="Locator_us-gaap_MembersCapital_304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_303" xlink:to="Locator_us-gaap_MembersCapital_304" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_305" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockValue" xlink:label="Locator_us-gaap_CommonStockValue_306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_305" xlink:to="Locator_us-gaap_CommonStockValue_306" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_307" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="Locator_us-gaap_AdditionalPaidInCapital_308" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_307" xlink:to="Locator_us-gaap_AdditionalPaidInCapital_308" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_309" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="Locator_us-gaap_RetainedEarningsAccumulatedDeficit_310" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_309" xlink:to="Locator_us-gaap_RetainedEarningsAccumulatedDeficit_310" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_311" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="Locator_us-gaap_TreasuryStockValue_312" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_311" xlink:to="Locator_us-gaap_TreasuryStockValue_312" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_313" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_314" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_313" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_314" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_315" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MembersEquity" xlink:label="Locator_us-gaap_MembersEquity_316" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_315" xlink:to="Locator_us-gaap_MembersEquity_316" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_317" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="Locator_us-gaap_StockholdersEquity_318" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_317" xlink:to="Locator_us-gaap_StockholdersEquity_318" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_319" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinorityInterest" xlink:label="Locator_us-gaap_MinorityInterest_320" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_319" xlink:to="Locator_us-gaap_MinorityInterest_320" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_321" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MembersEquityAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_MembersEquityAttributableToNoncontrollingInterest_322" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_321" xlink:to="Locator_us-gaap_MembersEquityAttributableToNoncontrollingInterest_322" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_323" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_323" xlink:to="Locator_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_324" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_325" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_326" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_325" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_326" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_327" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquity_328" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_327" xlink:to="Locator_us-gaap_LiabilitiesAndStockholdersEquity_328" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5" xlink:to="Locator_us-gaap_StatementTable_6" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedBalanceSheetParenthetical">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_369" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_370" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_369" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_370" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_373" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_374" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_373" xlink:to="Locator_us-gaap_ClassOfStockDomain_374" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_375" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_376" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_375" xlink:to="Locator_us-gaap_CommonClassAMember_376" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_377" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_378" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_377" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_378" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_379" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_380" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_379" xlink:to="Locator_us-gaap_CommonClassBMember_380" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_371" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_372" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_371" xlink:to="Locator_dei_LegalEntityAxis_372" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_381" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_382" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_381" xlink:to="Locator_dei_EntityDomain_382" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_383" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_384" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_383" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_384" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_385" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="Locator_us-gaap_PreferredStockSharesAuthorized_386" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_385" xlink:to="Locator_us-gaap_PreferredStockSharesAuthorized_386" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_387" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="Locator_us-gaap_PreferredStockSharesIssued_388" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_387" xlink:to="Locator_us-gaap_PreferredStockSharesIssued_388" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_389" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="Locator_us-gaap_CommonStockParOrStatedValuePerShare_390" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_389" xlink:to="Locator_us-gaap_CommonStockParOrStatedValuePerShare_390" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_391" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="Locator_us-gaap_CommonStockSharesAuthorized_392" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_391" xlink:to="Locator_us-gaap_CommonStockSharesAuthorized_392" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_393" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="Locator_us-gaap_CommonStockSharesIssued_394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_393" xlink:to="Locator_us-gaap_CommonStockSharesIssued_394" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_395" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="Locator_us-gaap_CommonStockSharesOutstanding_396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_395" xlink:to="Locator_us-gaap_CommonStockSharesOutstanding_396" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_397" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="Locator_us-gaap_TreasuryStockShares_398" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_397" xlink:to="Locator_us-gaap_TreasuryStockShares_398" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_399" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="Locator_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_400" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_399" xlink:to="Locator_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_400" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_401" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_402" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_401" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_402" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_365" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_366" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_365" xlink:to="Locator_us-gaap_StatementTable_366" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/StatementCondensedConsolidatedStatementOfIncome">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_509" xlink:to="Locator_dei_LegalEntityAxis_510" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_511" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_511" xlink:to="Locator_dei_EntityDomain_512" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_513" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_513" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_514" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_557" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="Locator_us-gaap_EarningsPerShareBasic_558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_557" xlink:to="Locator_us-gaap_EarningsPerShareBasic_558" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_559" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="Locator_us-gaap_EarningsPerShareDiluted_560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_559" xlink:to="Locator_us-gaap_EarningsPerShareDiluted_560" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_561" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="Locator_us-gaap_CommonStockDividendsPerShareDeclared_562" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_561" xlink:to="Locator_us-gaap_CommonStockDividendsPerShareDeclared_562" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_553" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_553" xlink:to="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_554" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_515" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_516" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_515" xlink:to="Locator_us-gaap_Revenues_516" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_517" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_517" xlink:to="Locator_us-gaap_CostsAndExpensesAbstract_518" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_519" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndProductionCosts" xlink:label="Locator_cmcsa_ProgrammingAndProductionCosts_520" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_519" xlink:to="Locator_cmcsa_ProgrammingAndProductionCosts_520" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_521" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherOperatingAndAdministrative" xlink:label="Locator_cmcsa_OtherOperatingAndAdministrative_522" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_521" xlink:to="Locator_cmcsa_OtherOperatingAndAdministrative_522" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_523" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="Locator_us-gaap_MarketingAndAdvertisingExpense_524" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_523" xlink:to="Locator_us-gaap_MarketingAndAdvertisingExpense_524" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_525" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Depreciation" xlink:label="Locator_us-gaap_Depreciation_526" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_525" xlink:to="Locator_us-gaap_Depreciation_526" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_527" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="Locator_us-gaap_AmortizationOfIntangibleAssets_528" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_527" xlink:to="Locator_us-gaap_AmortizationOfIntangibleAssets_528" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_529" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="Locator_us-gaap_CostsAndExpenses_530" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_529" xlink:to="Locator_us-gaap_CostsAndExpenses_530" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_531" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="Locator_us-gaap_OperatingIncomeLoss_532" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_531" xlink:to="Locator_us-gaap_OperatingIncomeLoss_532" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_533" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_534" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_533" xlink:to="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_534" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_535" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InterestExpense" xlink:label="Locator_us-gaap_InterestExpense_536" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_535" xlink:to="Locator_us-gaap_InterestExpense_536" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_537" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="Locator_us-gaap_InvestmentIncomeInterest_538" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_537" xlink:to="Locator_us-gaap_InvestmentIncomeInterest_538" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_539" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="Locator_us-gaap_InvestmentIncomeNonoperating_540" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_539" xlink:to="Locator_us-gaap_InvestmentIncomeNonoperating_540" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_541" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_542" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_541" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_542" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_543" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="Locator_us-gaap_OtherNonoperatingIncomeExpense_544" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_543" xlink:to="Locator_us-gaap_OtherNonoperatingIncomeExpense_544" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_545" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="Locator_us-gaap_NonoperatingIncomeExpense_546" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_545" xlink:to="Locator_us-gaap_NonoperatingIncomeExpense_546" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_547" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_548" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_547" xlink:to="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_548" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_549" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_IncomeTaxExpenseBenefit_550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_549" xlink:to="Locator_us-gaap_IncomeTaxExpenseBenefit_550" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_551" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_551" xlink:to="Locator_us-gaap_ProfitLoss_552" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_555" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="Locator_us-gaap_NetIncomeLoss_556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_555" xlink:to="Locator_us-gaap_NetIncomeLoss_556" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_445" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_446" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_445" xlink:to="Locator_us-gaap_StatementTable_446" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/StatementCondensedConsolidatedStatementOfCashFlows">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_711" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_712" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_711" xlink:to="Locator_dei_LegalEntityAxis_712" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_713" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_714" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_713" xlink:to="Locator_dei_EntityDomain_714" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_715" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_716" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_715" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_716" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_717" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_718" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_717" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_718" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_719" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_720" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_719" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_720" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_721" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_722" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_721" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_722" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_723" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireBuildings" xlink:label="Locator_us-gaap_PaymentsToAcquireBuildings_724" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_723" xlink:to="Locator_us-gaap_PaymentsToAcquireBuildings_724" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_725" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoteReceivableIssuedFromParent" xlink:label="Locator_cmcsa_NoteReceivableIssuedFromParent_726" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_725" xlink:to="Locator_cmcsa_NoteReceivableIssuedFromParent_726" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_727" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_728" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_727" xlink:to="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_728" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="Locator_us-gaap_PaymentsToAcquireIntangibleAssets_730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_729" xlink:to="Locator_us-gaap_PaymentsToAcquireIntangibleAssets_730" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_731" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties" xlink:label="Locator_cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties_732" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_731" xlink:to="Locator_cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties_732" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_733" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="Locator_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_734" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_733" xlink:to="Locator_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_734" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_735" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProceedsFromSalesOfBusinessesAndInvestments" xlink:label="Locator_cmcsa_ProceedsFromSalesOfBusinessesAndInvestments_736" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_735" xlink:to="Locator_cmcsa_ProceedsFromSalesOfBusinessesAndInvestments_736" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_737" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:label="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_738" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_737" xlink:to="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_738" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_739" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="Locator_us-gaap_PaymentsToAcquireInvestments_740" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_739" xlink:to="Locator_us-gaap_PaymentsToAcquireInvestments_740" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_741" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="Locator_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_742" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_741" xlink:to="Locator_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_742" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_743" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivities_744" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_743" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivities_744" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_745" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_746" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_745" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_746" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_747" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProceedsFromNoteReceivableIssuedToAndBorrowingsFromComcast" xlink:label="Locator_cmcsa_ProceedsFromNoteReceivableIssuedToAndBorrowingsFromComcast_748" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_747" xlink:to="Locator_cmcsa_ProceedsFromNoteReceivableIssuedToAndBorrowingsFromComcast_748" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_749" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RepaymentsOfBorrowingsFromComcast" xlink:label="Locator_cmcsa_RepaymentsOfBorrowingsFromComcast_750" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_749" xlink:to="Locator_cmcsa_RepaymentsOfBorrowingsFromComcast_750" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_751" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DecreaseInShortTermLoansToGENet" xlink:label="Locator_cmcsa_DecreaseInShortTermLoansToGENet_752" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_751" xlink:to="Locator_cmcsa_DecreaseInShortTermLoansToGENet_752" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_753" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock" xlink:label="Locator_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_754" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_753" xlink:to="Locator_us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock_754" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_755" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedemptionTransactionDistribution" xlink:label="Locator_cmcsa_RedemptionTransactionDistribution_756" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_755" xlink:to="Locator_cmcsa_RedemptionTransactionDistribution_756" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_757" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DistributionsToNBCUniversalNoncontrollingInterestHolders" xlink:label="Locator_cmcsa_DistributionsToNBCUniversalNoncontrollingInterestHolders_758" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_757" xlink:to="Locator_cmcsa_DistributionsToNBCUniversalNoncontrollingInterestHolders_758" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_759" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsOfCapitalDistribution" xlink:label="Locator_us-gaap_PaymentsOfCapitalDistribution_760" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_759" xlink:to="Locator_us-gaap_PaymentsOfCapitalDistribution_760" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_761" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DistributionsToOtherNoncontrollingInterests" xlink:label="Locator_cmcsa_DistributionsToOtherNoncontrollingInterests_762" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_761" xlink:to="Locator_cmcsa_DistributionsToOtherNoncontrollingInterests_762" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_763" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt" xlink:label="Locator_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_764" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_763" xlink:to="Locator_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_764" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_765" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromOtherDebt" xlink:label="Locator_us-gaap_ProceedsFromOtherDebt_766" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_765" xlink:to="Locator_us-gaap_ProceedsFromOtherDebt_766" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_767" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RepaymentsOfOtherDebt" xlink:label="Locator_us-gaap_RepaymentsOfOtherDebt_768" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_767" xlink:to="Locator_us-gaap_RepaymentsOfOtherDebt_768" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_769" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="Locator_us-gaap_PaymentsForRepurchaseOfCommonStock_770" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_769" xlink:to="Locator_us-gaap_PaymentsForRepurchaseOfCommonStock_770" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_771" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="Locator_us-gaap_PaymentsOfDividends_772" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_771" xlink:to="Locator_us-gaap_PaymentsOfDividends_772" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_773" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="Locator_us-gaap_ProceedsFromIssuanceOfCommonStock_774" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_773" xlink:to="Locator_us-gaap_ProceedsFromIssuanceOfCommonStock_774" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_775" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries" xlink:label="Locator_us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries_776" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_775" xlink:to="Locator_us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries_776" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_777" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock_778" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_777" xlink:to="Locator_cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock_778" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_779" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="Locator_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_780" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_779" xlink:to="Locator_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_780" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_781" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SettlementOfStationVentureLiability" xlink:label="Locator_cmcsa_SettlementOfStationVentureLiability_782" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_781" xlink:to="Locator_cmcsa_SettlementOfStationVentureLiability_782" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_783" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="Locator_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_783" xlink:to="Locator_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_784" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_785" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivities_786" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_785" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivities_786" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_787" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="Locator_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_787" xlink:to="Locator_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_788" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_789" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_789" xlink:to="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_790" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_791" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_791" xlink:to="Locator_us-gaap_StatementTable_792" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfChangesInEquity">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_847" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="Locator_us-gaap_StatementEquityComponentsAxis_848" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_847" xlink:to="Locator_us-gaap_StatementEquityComponentsAxis_848" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="Locator_us-gaap_StatementEquityComponentsAxis_849" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_850" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementEquityComponentsAxis_849" xlink:to="Locator_us-gaap_EquityComponentDomain_850" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="Locator_us-gaap_StatementEquityComponentsAxis_851" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_852" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_StatementEquityComponentsAxis_851" xlink:to="Locator_us-gaap_EquityComponentDomain_852" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_853" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember" xlink:label="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember_854" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_853" xlink:to="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubisdiaryPreferredStockMember_854" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_855" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_856" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_855" xlink:to="Locator_us-gaap_CommonClassAMember_856" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_857" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_858" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_857" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_858" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_859" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_860" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_859" xlink:to="Locator_us-gaap_CommonClassBMember_860" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_861" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="Locator_us-gaap_RetainedEarningsMember_862" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_861" xlink:to="Locator_us-gaap_RetainedEarningsMember_862" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_863" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="Locator_us-gaap_TreasuryStockMember_864" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_863" xlink:to="Locator_us-gaap_TreasuryStockMember_864" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_865" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeMember_866" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_865" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeMember_866" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_867" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="Locator_us-gaap_NoncontrollingInterestMember_868" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_867" xlink:to="Locator_us-gaap_NoncontrollingInterestMember_868" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_869" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedeemableNoncontrollingInterestMember" xlink:label="Locator_cmcsa_RedeemableNoncontrollingInterestMember_870" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_869" xlink:to="Locator_cmcsa_RedeemableNoncontrollingInterestMember_870" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_871" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockMember" xlink:label="Locator_us-gaap_CommonStockMember_872" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_871" xlink:to="Locator_us-gaap_CommonStockMember_872" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_873" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MembersCapitalMember" xlink:label="Locator_cmcsa_MembersCapitalMember_874" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_873" xlink:to="Locator_cmcsa_MembersCapitalMember_874" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="Locator_us-gaap_EquityComponentDomain_875" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="Locator_us-gaap_AdditionalPaidInCapitalMember_876" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityComponentDomain_875" xlink:to="Locator_us-gaap_AdditionalPaidInCapitalMember_876" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_877" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_878" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_877" xlink:to="Locator_dei_LegalEntityAxis_878" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_879" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_880" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_879" xlink:to="Locator_dei_EntityDomain_880" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_881" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_882" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_881" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_882" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_883" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_884" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_883" xlink:to="Locator_us-gaap_LimitedLiabilityCompanyLlcMembersEquityIncludingPortionAttributableToNoncontrollingInterest_884" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_885" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MembersEquityRemeasured" xlink:label="Locator_cmcsa_MembersEquityRemeasured_886" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_885" xlink:to="Locator_cmcsa_MembersEquityRemeasured_886" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_887" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ContributionOfComcastContentBusiness" xlink:label="Locator_cmcsa_ContributionOfComcastContentBusiness_888" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_887" xlink:to="Locator_cmcsa_ContributionOfComcastContentBusiness_888" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_889" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_890" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_889" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_890" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_891" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:label="Locator_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_892" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_891" xlink:to="Locator_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_892" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_893" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_894" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_893" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_894" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_895" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncontrollingInterestIncreaseDecreaseRelatedToAcquisition" xlink:label="Locator_cmcsa_NoncontrollingInterestIncreaseDecreaseRelatedToAcquisition_896" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_895" xlink:to="Locator_cmcsa_NoncontrollingInterestIncreaseDecreaseRelatedToAcquisition_896" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_897" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="Locator_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_898" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_897" xlink:to="Locator_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_898" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_899" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossNetOfTax_900" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_899" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossNetOfTax_900" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_901" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions" xlink:label="Locator_us-gaap_MinorityInterestDecreaseFromRedemptions_902" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_901" xlink:to="Locator_us-gaap_MinorityInterestDecreaseFromRedemptions_902" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_903" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedemptionTransactionDistribution" xlink:label="Locator_cmcsa_RedemptionTransactionDistribution_904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_903" xlink:to="Locator_cmcsa_RedemptionTransactionDistribution_904" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_905" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="Locator_us-gaap_DividendsCommonStockCash_906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_905" xlink:to="Locator_us-gaap_DividendsCommonStockCash_906" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_907" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PurchaseOfNoncontrollingCommonEquityInterest" xlink:label="Locator_cmcsa_PurchaseOfNoncontrollingCommonEquityInterest_908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_907" xlink:to="Locator_cmcsa_PurchaseOfNoncontrollingCommonEquityInterest_908" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_909" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests" xlink:label="Locator_cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests_910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_909" xlink:to="Locator_cmcsa_NoncontrollingInterestDecreaseFromRedemptionsOrPurchaseOfInterests_910" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_911" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest" xlink:label="Locator_cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest_912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_911" xlink:to="Locator_cmcsa_NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest_912" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_913" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SubsidiaryPreferredStock" xlink:label="Locator_cmcsa_SubsidiaryPreferredStock_914" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_913" xlink:to="Locator_cmcsa_SubsidiaryPreferredStock_914" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_915" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests" xlink:label="Locator_cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests_916" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_915" xlink:to="Locator_cmcsa_ContributionsFromAndDistributionsToNoncontrollingInterests_916" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_917" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityOther" xlink:label="Locator_us-gaap_StockholdersEquityOther_918" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_917" xlink:to="Locator_us-gaap_StockholdersEquityOther_918" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_919" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EquityProfitLoss" xlink:label="Locator_cmcsa_EquityProfitLoss_920" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_919" xlink:to="Locator_cmcsa_EquityProfitLoss_920" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_921" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_922" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_921" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_922" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_923" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_924" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_923" xlink:to="Locator_us-gaap_StatementTable_924" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfComprehensiveIncome">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1019" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1019" xlink:to="Locator_dei_LegalEntityAxis_1020" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1021" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1021" xlink:to="Locator_dei_EntityDomain_1022" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1023" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1023" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1024" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1027" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_1028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1027" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_1028" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1029" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_1030" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1029" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax_1030" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1031" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AmountsReclassifiedToNetIncomeAbstract" xlink:label="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_1032" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1031" xlink:to="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_1032" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AmountsReclassifiedToNetIncomeAbstract" xlink:label="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_1033" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_1034" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_1033" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_1034" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AmountsReclassifiedToNetIncomeAbstract" xlink:label="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_1035" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_1036" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_AmountsReclassifiedToNetIncomeAbstract_1035" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax_1036" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1037" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_1038" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1037" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_1038" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1039" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_1040" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1039" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_1040" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1041" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherOCI" xlink:label="Locator_cmcsa_OtherOCI_1042" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1041" xlink:to="Locator_cmcsa_OtherOCI_1042" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1043" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_1044" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1043" xlink:to="Locator_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_1044" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1049" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_1050" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1049" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_1050" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1047" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_1048" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1047" xlink:to="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_1048" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1051" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="Locator_us-gaap_ComprehensiveIncomeNetOfTax_1052" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1051" xlink:to="Locator_us-gaap_ComprehensiveIncomeNetOfTax_1052" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1025" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_1026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1025" xlink:to="Locator_us-gaap_ProfitLoss_1026" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1045" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_1046" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1045" xlink:to="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_1046" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_991" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_992" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_991" xlink:to="Locator_us-gaap_StatementTable_992" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfComprehensiveIncomeParenthetical">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1073" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1074" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1073" xlink:to="Locator_dei_LegalEntityAxis_1074" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1075" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1076" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1075" xlink:to="Locator_dei_EntityDomain_1076" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1077" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_1078" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1077" xlink:to="Locator_us-gaap_ParentCompanyMember_1078" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1079" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1080" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1079" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1080" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1081" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_1082" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1081" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_1082" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1083" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_1084" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1083" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax_1084" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1085" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_1086" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1085" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_1086" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1087" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_1088" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1087" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax_1088" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1089" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_1090" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1089" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_1090" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1091" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_1092" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1091" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_1092" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1093" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1094" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1093" xlink:to="Locator_us-gaap_StatementTable_1094" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/RecentAccountingPronouncements">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1115" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1116" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1115" xlink:to="Locator_dei_LegalEntityAxis_1116" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1117" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1118" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1117" xlink:to="Locator_dei_EntityDomain_1118" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1119" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1120" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1119" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1120" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1121" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" xlink:label="Locator_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_1122" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1121" xlink:to="Locator_us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock_1122" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1123" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DescriptionOfNewAccountingPronouncementsNotYetAdopted" xlink:label="Locator_us-gaap_DescriptionOfNewAccountingPronouncementsNotYetAdopted_1124" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1123" xlink:to="Locator_us-gaap_DescriptionOfNewAccountingPronouncementsNotYetAdopted_1124" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1111" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1112" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1111" xlink:to="Locator_us-gaap_StatementTable_1112" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSignificantTransactions">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1137" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1138" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1137" xlink:to="Locator_dei_LegalEntityAxis_1138" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1139" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1140" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1139" xlink:to="Locator_dei_EntityDomain_1140" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1141" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1142" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1141" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1142" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1143" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsTextBlock" xlink:label="Locator_cmcsa_SignificantTransactionsTextBlock_1144" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1143" xlink:to="Locator_cmcsa_SignificantTransactionsTextBlock_1144" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1145" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1146" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1145" xlink:to="Locator_us-gaap_StatementTable_1146" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestments">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1163" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1164" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1163" xlink:to="Locator_dei_LegalEntityAxis_1164" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1165" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1166" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1165" xlink:to="Locator_dei_EntityDomain_1166" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1167" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1168" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1167" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1168" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1169" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_InvestmentsTextBlock" xlink:label="Locator_cmcsa_InvestmentsTextBlock_1170" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1169" xlink:to="Locator_cmcsa_InvestmentsTextBlock_1170" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1159" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1160" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1159" xlink:to="Locator_us-gaap_StatementTable_1160" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureGoodwillAndIntangibleAssets">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1183" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1184" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1183" xlink:to="Locator_dei_LegalEntityAxis_1184" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1185" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1186" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1185" xlink:to="Locator_dei_EntityDomain_1186" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1187" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1188" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1187" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1188" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1189" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillDisclosureTextBlock" xlink:label="Locator_us-gaap_GoodwillDisclosureTextBlock_1190" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1189" xlink:to="Locator_us-gaap_GoodwillDisclosureTextBlock_1190" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1191" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:label="Locator_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_1192" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1191" xlink:to="Locator_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_1192" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1193" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1194" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1193" xlink:to="Locator_us-gaap_StatementTable_1194" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebt">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1211" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1212" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1211" xlink:to="Locator_dei_LegalEntityAxis_1212" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1213" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1214" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1213" xlink:to="Locator_dei_EntityDomain_1214" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1215" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1216" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1215" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1216" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1217" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="Locator_us-gaap_DebtDisclosureTextBlock_1218" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1217" xlink:to="Locator_us-gaap_DebtDisclosureTextBlock_1218" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1207" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1208" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1207" xlink:to="Locator_us-gaap_StatementTable_1208" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFairValueMeasurements">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1229" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1229" xlink:to="Locator_dei_LegalEntityAxis_1230" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1231" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1231" xlink:to="Locator_dei_EntityDomain_1232" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1233" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1233" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1234" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1235" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="Locator_us-gaap_FairValueDisclosuresTextBlock_1236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1235" xlink:to="Locator_us-gaap_FairValueDisclosuresTextBlock_1236" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1237" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1237" xlink:to="Locator_us-gaap_StatementTable_1238" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureNoncontrollingInterests">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1255" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1255" xlink:to="Locator_dei_LegalEntityAxis_1256" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1257" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1257" xlink:to="Locator_dei_EntityDomain_1258" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1259" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1259" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1260" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinorityInterestDisclosureTextBlock" xlink:label="Locator_us-gaap_MinorityInterestDisclosureTextBlock_1262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1261" xlink:to="Locator_us-gaap_MinorityInterestDisclosureTextBlock_1262" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1251" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1251" xlink:to="Locator_us-gaap_StatementTable_1252" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquity">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1273" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1273" xlink:to="Locator_dei_LegalEntityAxis_1274" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1275" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1275" xlink:to="Locator_dei_EntityDomain_1276" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1277" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1277" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1278" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1279" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="Locator_us-gaap_StockholdersEquityNoteDisclosureTextBlock_1280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1279" xlink:to="Locator_us-gaap_StockholdersEquityNoteDisclosureTextBlock_1280" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1281" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1281" xlink:to="Locator_us-gaap_StatementTable_1282" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformation">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1295" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1295" xlink:to="Locator_dei_LegalEntityAxis_1296" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1297" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1297" xlink:to="Locator_dei_EntityDomain_1298" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1299" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1299" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1300" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1301" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdditionalFinancialInformationDisclosureTextBlock" xlink:label="Locator_us-gaap_AdditionalFinancialInformationDisclosureTextBlock_1302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1301" xlink:to="Locator_us-gaap_AdditionalFinancialInformationDisclosureTextBlock_1302" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1303" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1303" xlink:to="Locator_us-gaap_StatementTable_1304" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCommitmentsAndContingencies">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1317" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1318" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1317" xlink:to="Locator_dei_LegalEntityAxis_1318" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1319" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1320" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1319" xlink:to="Locator_dei_EntityDomain_1320" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1321" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1322" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1321" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1322" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1323" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="Locator_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1323" xlink:to="Locator_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1324" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1325" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1326" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1325" xlink:to="Locator_us-gaap_StatementTable_1326" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegment">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1339" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1340" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1339" xlink:to="Locator_dei_LegalEntityAxis_1340" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1341" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1342" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1341" xlink:to="Locator_dei_EntityDomain_1342" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1343" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1344" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1343" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1344" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1345" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="Locator_us-gaap_SegmentReportingDisclosureTextBlock_1346" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1345" xlink:to="Locator_us-gaap_SegmentReportingDisclosureTextBlock_1346" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1347" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1348" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1347" xlink:to="Locator_us-gaap_StatementTable_1348" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1405" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1406" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1405" xlink:to="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1406" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1411" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1412" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1411" xlink:to="Locator_us-gaap_EquityMethodInvesteeNameDomain_1412" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1459" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1460" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1459" xlink:to="Locator_us-gaap_EquityMethodInvesteeNameDomain_1460" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1413" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SpectrumCoLlcMember" xlink:label="Locator_cmcsa_SpectrumCoLlcMember_1414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1413" xlink:to="Locator_cmcsa_SpectrumCoLlcMember_1414" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1415" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ClearwireLlcMember" xlink:label="Locator_cmcsa_ClearwireLlcMember_1416" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1415" xlink:to="Locator_cmcsa_ClearwireLlcMember_1416" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1417" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherEquityMethodInvestmentsMember" xlink:label="Locator_cmcsa_OtherEquityMethodInvestmentsMember_1418" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1417" xlink:to="Locator_cmcsa_OtherEquityMethodInvestmentsMember_1418" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1419" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AirTouchMember" xlink:label="Locator_cmcsa_AirTouchMember_1420" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1419" xlink:to="Locator_cmcsa_AirTouchMember_1420" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1421" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherInvestmentMember" xlink:label="Locator_cmcsa_OtherInvestmentMember_1422" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1421" xlink:to="Locator_cmcsa_OtherInvestmentMember_1422" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1423" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquitySecuritiesMember" xlink:label="Locator_us-gaap_EquitySecuritiesMember_1424" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1423" xlink:to="Locator_us-gaap_EquitySecuritiesMember_1424" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1427" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AeTelevisionNetworksLlcMember" xlink:label="Locator_cmcsa_AeTelevisionNetworksLlcMember_1428" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1427" xlink:to="Locator_cmcsa_AeTelevisionNetworksLlcMember_1428" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1429" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_WeatherChannelMember" xlink:label="Locator_cmcsa_WeatherChannelMember_1430" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1429" xlink:to="Locator_cmcsa_WeatherChannelMember_1430" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1431" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MsnbccomMember" xlink:label="Locator_cmcsa_MsnbccomMember_1432" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1431" xlink:to="Locator_cmcsa_MsnbccomMember_1432" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1433" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_HuluMember" xlink:label="Locator_cmcsa_HuluMember_1434" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1433" xlink:to="Locator_cmcsa_HuluMember_1434" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1425" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueMethodMember" xlink:label="Locator_cmcsa_FairValueMethodMember_1426" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1425" xlink:to="Locator_cmcsa_FairValueMethodMember_1426" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1409" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1410" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1409" xlink:to="Locator_cmcsa_LegalEntity1Axis_1410" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1435" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1436" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_1435" xlink:to="Locator_cmcsa_Entity1Domain_1436" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1457" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1458" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_cmcsa_LegalEntity1Axis_1457" xlink:to="Locator_cmcsa_Entity1Domain_1458" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1437" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1438" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1437" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1438" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1407" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1408" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1407" xlink:to="Locator_dei_LegalEntityAxis_1408" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1439" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1440" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1439" xlink:to="Locator_dei_EntityDomain_1440" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1441" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AirTouchMember" xlink:label="Locator_cmcsa_AirTouchMember_1442" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1441" xlink:to="Locator_cmcsa_AirTouchMember_1442" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1443" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MarketableSecurities" xlink:label="Locator_us-gaap_MarketableSecurities_1444" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1443" xlink:to="Locator_us-gaap_MarketableSecurities_1444" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1445" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AvailableForSaleSecuritiesNoncurrent" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesNoncurrent_1446" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1445" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesNoncurrent_1446" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1447" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="Locator_us-gaap_EquityMethodInvestments_1448" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1447" xlink:to="Locator_us-gaap_EquityMethodInvestments_1448" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1449" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostMethodInvestments" xlink:label="Locator_us-gaap_CostMethodInvestments_1450" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1449" xlink:to="Locator_us-gaap_CostMethodInvestments_1450" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1451" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Investments" xlink:label="Locator_us-gaap_Investments_1452" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1451" xlink:to="Locator_us-gaap_Investments_1452" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1453" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="Locator_us-gaap_ShortTermInvestments_1454" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1453" xlink:to="Locator_us-gaap_ShortTermInvestments_1454" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1455" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="Locator_us-gaap_LongTermInvestments_1456" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1455" xlink:to="Locator_us-gaap_LongTermInvestments_1456" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1393" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1393" xlink:to="Locator_us-gaap_StatementTable_1394" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsFairValueMethodInvestmentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1551" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1551" xlink:to="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1552" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1559" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_1559" xlink:to="Locator_us-gaap_EquityMethodInvesteeNameDomain_1560" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvesteeNameDomain" xlink:label="Locator_us-gaap_EquityMethodInvesteeNameDomain_1561" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueMethodMember" xlink:label="Locator_cmcsa_FairValueMethodMember_1562" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_EquityMethodInvesteeNameDomain_1561" xlink:to="Locator_cmcsa_FairValueMethodMember_1562" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1555" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1555" xlink:to="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1556" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1567" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1568" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1567" xlink:to="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1568" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1641" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_1641" xlink:to="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1642" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1569" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PrepaidForwardSaleObligationsMember" xlink:label="Locator_cmcsa_PrepaidForwardSaleObligationsMember_1570" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_1569" xlink:to="Locator_cmcsa_PrepaidForwardSaleObligationsMember_1570" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1557" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1557" xlink:to="Locator_cmcsa_LegalEntity1Axis_1558" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1563" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1564" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_1563" xlink:to="Locator_cmcsa_Entity1Domain_1564" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1565" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1566" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1565" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1566" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1553" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1553" xlink:to="Locator_dei_LegalEntityAxis_1554" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1571" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1572" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1571" xlink:to="Locator_dei_EntityDomain_1572" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1575" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SpectrumCoLlcMember" xlink:label="Locator_cmcsa_SpectrumCoLlcMember_1576" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1575" xlink:to="Locator_cmcsa_SpectrumCoLlcMember_1576" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1577" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MsnbccomMember" xlink:label="Locator_cmcsa_MsnbccomMember_1578" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1577" xlink:to="Locator_cmcsa_MsnbccomMember_1578" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1581" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ClearwireLlcMember" xlink:label="Locator_cmcsa_ClearwireLlcMember_1582" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1581" xlink:to="Locator_cmcsa_ClearwireLlcMember_1582" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1583" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AeTelevisionNetworksLlcMember" xlink:label="Locator_cmcsa_AeTelevisionNetworksLlcMember_1584" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1583" xlink:to="Locator_cmcsa_AeTelevisionNetworksLlcMember_1584" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1585" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ClearwireCorpMember" xlink:label="Locator_cmcsa_ClearwireCorpMember_1586" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1585" xlink:to="Locator_cmcsa_ClearwireCorpMember_1586" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1587" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SubsidiaryOfLibertyMediaMember" xlink:label="Locator_cmcsa_SubsidiaryOfLibertyMediaMember_1588" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1587" xlink:to="Locator_cmcsa_SubsidiaryOfLibertyMediaMember_1588" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1589" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CurrentYearPurchasesMember" xlink:label="Locator_cmcsa_CurrentYearPurchasesMember_1590" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1589" xlink:to="Locator_cmcsa_CurrentYearPurchasesMember_1590" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1591" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueOfSpecificContractObligationMember" xlink:label="Locator_cmcsa_FairValueOfSpecificContractObligationMember_1592" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1591" xlink:to="Locator_cmcsa_FairValueOfSpecificContractObligationMember_1592" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1593" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LibertyMediaRedemptionTransactionMember" xlink:label="Locator_cmcsa_LibertyMediaRedemptionTransactionMember_1594" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1593" xlink:to="Locator_cmcsa_LibertyMediaRedemptionTransactionMember_1594" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1579" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_WeatherChannelMember" xlink:label="Locator_cmcsa_WeatherChannelMember_1580" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1579" xlink:to="Locator_cmcsa_WeatherChannelMember_1580" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1573" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_1574" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1573" xlink:to="Locator_us-gaap_ParentCompanyMember_1574" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1595" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EquitySecuritiesHeldAsCollateral" xlink:label="Locator_cmcsa_EquitySecuritiesHeldAsCollateral_1596" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1595" xlink:to="Locator_cmcsa_EquitySecuritiesHeldAsCollateral_1596" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1597" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PercentageOfFairValueDebtAndEquitySecuritiesHeldAsCollateral" xlink:label="Locator_cmcsa_PercentageOfFairValueDebtAndEquitySecuritiesHeldAsCollateral_1598" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1597" xlink:to="Locator_cmcsa_PercentageOfFairValueDebtAndEquitySecuritiesHeldAsCollateral_1598" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1599" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ObligationsUnderPrepaidForwardSaleAgreements" xlink:label="Locator_cmcsa_ObligationsUnderPrepaidForwardSaleAgreements_1600" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1599" xlink:to="Locator_cmcsa_ObligationsUnderPrepaidForwardSaleAgreements_1600" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1601" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreements" xlink:label="Locator_cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreements_1602" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1601" xlink:to="Locator_cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreements_1602" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1603" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LiabilitiesRelatedToPrepaidForwardSaleAgreements" xlink:label="Locator_cmcsa_LiabilitiesRelatedToPrepaidForwardSaleAgreements_1604" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1603" xlink:to="Locator_cmcsa_LiabilitiesRelatedToPrepaidForwardSaleAgreements_1604" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1605" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PrepaidForwardSaleObligationsFairValue" xlink:label="Locator_cmcsa_PrepaidForwardSaleObligationsFairValue_1606" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1605" xlink:to="Locator_cmcsa_PrepaidForwardSaleObligationsFairValue_1606" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1607" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains_1608" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1607" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains_1608" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1609" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss_1610" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1609" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss_1610" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1611" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges" xlink:label="Locator_cmcsa_CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges_1612" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1611" xlink:to="Locator_cmcsa_CumulativeUnrealizedGainsLossesInEarningsRelatedToFairValueHedges_1612" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1613" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities" xlink:label="Locator_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_1614" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1613" xlink:to="Locator_us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities_1614" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1615" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedGains" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesGrossRealizedGains_1616" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1615" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesGrossRealizedGains_1616" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1617" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConversionOfStockSharesIssued1" xlink:label="Locator_us-gaap_ConversionOfStockSharesIssued1_1618" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1617" xlink:to="Locator_us-gaap_ConversionOfStockSharesIssued1_1618" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1619" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent" xlink:label="Locator_us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent_1620" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1619" xlink:to="Locator_us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent_1620" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1621" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EquityMethodInvestmentSharesIssued" xlink:label="Locator_cmcsa_EquityMethodInvestmentSharesIssued_1622" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1621" xlink:to="Locator_cmcsa_EquityMethodInvestmentSharesIssued_1622" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1623" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentOwnedBalanceShares" xlink:label="Locator_us-gaap_InvestmentOwnedBalanceShares_1624" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1623" xlink:to="Locator_us-gaap_InvestmentOwnedBalanceShares_1624" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1625" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PrepaidForwardObligationsSettlement" xlink:label="Locator_cmcsa_PrepaidForwardObligationsSettlement_1626" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1625" xlink:to="Locator_cmcsa_PrepaidForwardObligationsSettlement_1626" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1627" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EquitySecuritiesPurchasedInPeriod" xlink:label="Locator_cmcsa_EquitySecuritiesPurchasedInPeriod_1628" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1627" xlink:to="Locator_cmcsa_EquitySecuritiesPurchasedInPeriod_1628" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1629" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SharesRedeemed" xlink:label="Locator_cmcsa_SharesRedeemed_1630" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1629" xlink:to="Locator_cmcsa_SharesRedeemed_1630" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1631" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SharesHeldInAcquiredEntity" xlink:label="Locator_cmcsa_SharesHeldInAcquiredEntity_1632" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1631" xlink:to="Locator_cmcsa_SharesHeldInAcquiredEntity_1632" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1635" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueOfSharesDeliveredInTransaction" xlink:label="Locator_cmcsa_FairValueOfSharesDeliveredInTransaction_1636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1635" xlink:to="Locator_cmcsa_FairValueOfSharesDeliveredInTransaction_1636" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1637" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInvestmentSharesSold" xlink:label="Locator_cmcsa_FairValueInvestmentSharesSold_1638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1637" xlink:to="Locator_cmcsa_FairValueInvestmentSharesSold_1638" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1639" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueEquitySecuritiesSettlement" xlink:label="Locator_cmcsa_FairValueEquitySecuritiesSettlement_1640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1639" xlink:to="Locator_cmcsa_FairValueEquitySecuritiesSettlement_1640" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1633" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_1634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1633" xlink:to="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_1634" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1547" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1548" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1547" xlink:to="Locator_us-gaap_StatementTable_1548" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsEquityMethodInvestmentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1735" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1736" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1735" xlink:to="Locator_cmcsa_LegalEntity1Axis_1736" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_1737" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1738" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_1737" xlink:to="Locator_cmcsa_Entity1Domain_1738" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_1739" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1740" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_1739" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1740" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1733" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1734" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1733" xlink:to="Locator_dei_LegalEntityAxis_1734" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1741" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1742" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1741" xlink:to="Locator_dei_EntityDomain_1742" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1743" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_WeatherChannelMember" xlink:label="Locator_cmcsa_WeatherChannelMember_1744" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1743" xlink:to="Locator_cmcsa_WeatherChannelMember_1744" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1745" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_HuluMember" xlink:label="Locator_cmcsa_HuluMember_1746" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1745" xlink:to="Locator_cmcsa_HuluMember_1746" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1747" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="Locator_us-gaap_EquityMethodInvestmentOwnershipPercentage_1748" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1747" xlink:to="Locator_us-gaap_EquityMethodInvestmentOwnershipPercentage_1748" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1749" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax" xlink:label="Locator_us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax_1750" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1749" xlink:to="Locator_us-gaap_SignificantAcquisitionsAndDisposalsGainLossOnSaleOrDisposalPretax_1750" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1751" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds" xlink:label="Locator_us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds_1752" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1751" xlink:to="Locator_us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds_1752" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1753" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity" xlink:label="Locator_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_1754" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1753" xlink:to="Locator_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_1754" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1755" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NumberOfWireLessSpectrumLicenses" xlink:label="Locator_cmcsa_NumberOfWireLessSpectrumLicenses_1756" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1755" xlink:to="Locator_cmcsa_NumberOfWireLessSpectrumLicenses_1756" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1757" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CashPaidByEquityMethodInvestmentForIntangibleAssets" xlink:label="Locator_cmcsa_CashPaidByEquityMethodInvestmentForIntangibleAssets_1758" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1757" xlink:to="Locator_cmcsa_CashPaidByEquityMethodInvestmentForIntangibleAssets_1758" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1759" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments" xlink:label="Locator_us-gaap_PaymentsToAcquireEquityMethodInvestments_1760" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1759" xlink:to="Locator_us-gaap_PaymentsToAcquireEquityMethodInvestments_1760" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1761" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ExpectedProceedsReceivedByEquityMethodInvestmentForSaleOfIntangibleAssets" xlink:label="Locator_cmcsa_ExpectedProceedsReceivedByEquityMethodInvestmentForSaleOfIntangibleAssets_1762" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1761" xlink:to="Locator_cmcsa_ExpectedProceedsReceivedByEquityMethodInvestmentForSaleOfIntangibleAssets_1762" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1763" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ExpectedProceedsFromSaleOfEquityMethodInvestment" xlink:label="Locator_cmcsa_ExpectedProceedsFromSaleOfEquityMethodInvestment_1764" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1763" xlink:to="Locator_cmcsa_ExpectedProceedsFromSaleOfEquityMethodInvestment_1764" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1765" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_InitialInvestmentByInvestorGroup" xlink:label="Locator_cmcsa_InitialInvestmentByInvestorGroup_1766" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1765" xlink:to="Locator_cmcsa_InitialInvestmentByInvestorGroup_1766" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1767" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_InitialInvestmentInEquityMethodInvestment" xlink:label="Locator_cmcsa_InitialInvestmentInEquityMethodInvestment_1768" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1767" xlink:to="Locator_cmcsa_InitialInvestmentInEquityMethodInvestment_1768" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1769" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromSaleOfIntangibleAssets" xlink:label="Locator_us-gaap_ProceedsFromSaleOfIntangibleAssets_1770" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1769" xlink:to="Locator_us-gaap_ProceedsFromSaleOfIntangibleAssets_1770" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1771" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PercentageOfCashReceivedFromInvestees" xlink:label="Locator_cmcsa_PercentageOfCashReceivedFromInvestees_1772" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1771" xlink:to="Locator_cmcsa_PercentageOfCashReceivedFromInvestees_1772" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1773" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EquityMethodInvestmentProceedsFromSaleOfAsset" xlink:label="Locator_cmcsa_EquityMethodInvestmentProceedsFromSaleOfAsset_1774" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1773" xlink:to="Locator_cmcsa_EquityMethodInvestmentProceedsFromSaleOfAsset_1774" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1775" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IncomeLossFromEquityMethodInvestmentsRelatedToGainLossOnSaleOfAsset" xlink:label="Locator_cmcsa_IncomeLossFromEquityMethodInvestmentsRelatedToGainLossOnSaleOfAsset_1776" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1775" xlink:to="Locator_cmcsa_IncomeLossFromEquityMethodInvestmentsRelatedToGainLossOnSaleOfAsset_1776" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1777" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentNetSalesProceeds" xlink:label="Locator_us-gaap_EquityMethodInvestmentNetSalesProceeds_1778" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1777" xlink:to="Locator_us-gaap_EquityMethodInvestmentNetSalesProceeds_1778" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1779" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal" xlink:label="Locator_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_1780" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1779" xlink:to="Locator_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_1780" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1781" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxExpenseOnSaleOfEquityMethodInvestment" xlink:label="Locator_cmcsa_TaxExpenseOnSaleOfEquityMethodInvestment_1782" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1781" xlink:to="Locator_cmcsa_TaxExpenseOnSaleOfEquityMethodInvestment_1782" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1783" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TotalDistributionFromInvestee" xlink:label="Locator_cmcsa_TotalDistributionFromInvestee_1784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1783" xlink:to="Locator_cmcsa_TotalDistributionFromInvestee_1784" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1785" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment" xlink:label="Locator_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_1786" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1785" xlink:to="Locator_us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment_1786" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1729" xlink:to="Locator_us-gaap_StatementTable_1730" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsCostMethodInvestmentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1817" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1818" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1817" xlink:to="Locator_dei_LegalEntityAxis_1818" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1819" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1820" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1819" xlink:to="Locator_dei_EntityDomain_1820" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1821" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AirTouchMember" xlink:label="Locator_cmcsa_AirTouchMember_1822" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1821" xlink:to="Locator_cmcsa_AirTouchMember_1822" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1823" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PreferredSharesRedeemableInApril2020Member" xlink:label="Locator_cmcsa_PreferredSharesRedeemableInApril2020Member_1824" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1823" xlink:to="Locator_cmcsa_PreferredSharesRedeemableInApril2020Member_1824" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1825" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueOfCostMethodInvestmentRedeemablePreferredShares" xlink:label="Locator_cmcsa_FairValueOfCostMethodInvestmentRedeemablePreferredShares_1826" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1825" xlink:to="Locator_cmcsa_FairValueOfCostMethodInvestmentRedeemablePreferredShares_1826" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1827" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PreferredStockAggregateRedemptionValue" xlink:label="Locator_cmcsa_PreferredStockAggregateRedemptionValue_1828" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1827" xlink:to="Locator_cmcsa_PreferredStockAggregateRedemptionValue_1828" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1829" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CarryingAmountOfRedeemablePreferredStock" xlink:label="Locator_cmcsa_CarryingAmountOfRedeemablePreferredStock_1830" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1829" xlink:to="Locator_cmcsa_CarryingAmountOfRedeemablePreferredStock_1830" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1833" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NonredeemablePreferredStock" xlink:label="Locator_cmcsa_NonredeemablePreferredStock_1834" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1833" xlink:to="Locator_cmcsa_NonredeemablePreferredStock_1834" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1831" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueAmountOfRedeemablePreferredShares" xlink:label="Locator_cmcsa_FairValueAmountOfRedeemablePreferredShares_1832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1831" xlink:to="Locator_cmcsa_FairValueAmountOfRedeemablePreferredShares_1832" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1813" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1814" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1813" xlink:to="Locator_us-gaap_StatementTable_1814" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePropertyAndEquipmentDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1865" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1866" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1865" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1866" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1867" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1868" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1867" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1868" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1869" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1870" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1869" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1870" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1871" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableDistributionSystemMember" xlink:label="Locator_cmcsa_CableDistributionSystemMember_1872" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1871" xlink:to="Locator_cmcsa_CableDistributionSystemMember_1872" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1873" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CustomerPremiseEquipmentMember" xlink:label="Locator_cmcsa_CustomerPremiseEquipmentMember_1874" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1873" xlink:to="Locator_cmcsa_CustomerPremiseEquipmentMember_1874" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1875" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember" xlink:label="Locator_us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember_1876" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1875" xlink:to="Locator_us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember_1876" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1877" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BuildingAndBuildingImprovementsMember" xlink:label="Locator_us-gaap_BuildingAndBuildingImprovementsMember_1878" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1877" xlink:to="Locator_us-gaap_BuildingAndBuildingImprovementsMember_1878" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1879" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FurnitureAndFixturesMember" xlink:label="Locator_us-gaap_FurnitureAndFixturesMember_1880" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1879" xlink:to="Locator_us-gaap_FurnitureAndFixturesMember_1880" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1881" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastCenterMember" xlink:label="Locator_cmcsa_ComcastCenterMember_1882" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1881" xlink:to="Locator_cmcsa_ComcastCenterMember_1882" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1883" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AcquisitionOfRealEstatePropertiesMember" xlink:label="Locator_cmcsa_AcquisitionOfRealEstatePropertiesMember_1884" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_PropertyPlantAndEquipmentTypeDomain_1883" xlink:to="Locator_cmcsa_AcquisitionOfRealEstatePropertiesMember_1884" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1885" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1886" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1885" xlink:to="Locator_dei_LegalEntityAxis_1886" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1887" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1888" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1887" xlink:to="Locator_dei_EntityDomain_1888" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1889" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1890" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1889" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1890" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1891" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_WeightedAverageOriginalUsefulLife" xlink:label="Locator_cmcsa_WeightedAverageOriginalUsefulLife_1892" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1891" xlink:to="Locator_cmcsa_WeightedAverageOriginalUsefulLife_1892" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1893" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableDistributionSystems" xlink:label="Locator_cmcsa_CableDistributionSystems_1894" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1893" xlink:to="Locator_cmcsa_CableDistributionSystems_1894" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1895" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CustomerPremiseEquipment" xlink:label="Locator_cmcsa_CustomerPremiseEquipment_1896" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1895" xlink:to="Locator_cmcsa_CustomerPremiseEquipment_1896" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1897" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOther" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentOther_1898" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1897" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentOther_1898" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1899" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BuildingsAndImprovementsGross" xlink:label="Locator_us-gaap_BuildingsAndImprovementsGross_1900" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1899" xlink:to="Locator_us-gaap_BuildingsAndImprovementsGross_1900" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1901" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Land" xlink:label="Locator_us-gaap_Land_1902" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1901" xlink:to="Locator_us-gaap_Land_1902" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1903" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FurnitureAndFixturesGross" xlink:label="Locator_us-gaap_FurnitureAndFixturesGross_1904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1903" xlink:to="Locator_us-gaap_FurnitureAndFixturesGross_1904" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1905" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="Locator_us-gaap_ConstructionInProgressGross_1906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1905" xlink:to="Locator_us-gaap_ConstructionInProgressGross_1906" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1907" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentGross_1908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1907" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentGross_1908" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1909" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAdditions" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentAdditions_1910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1909" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentAdditions_1910" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1911" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1911" xlink:to="Locator_us-gaap_StatementTable_1912" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureGoodwillRollforwardDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1947" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_1948" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1947" xlink:to="Locator_us-gaap_StatementBusinessSegmentsAxis_1948" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_1949" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1950" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementBusinessSegmentsAxis_1949" xlink:to="Locator_us-gaap_SegmentDomain_1950" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1951" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsMember" xlink:label="Locator_cmcsa_CableCommunicationsMember_1952" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1951" xlink:to="Locator_cmcsa_CableCommunicationsMember_1952" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1953" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableNetworksMember" xlink:label="Locator_cmcsa_CableNetworksMember_1954" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1953" xlink:to="Locator_cmcsa_CableNetworksMember_1954" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1955" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_BroadcastTelevisionMember" xlink:label="Locator_cmcsa_BroadcastTelevisionMember_1956" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1955" xlink:to="Locator_cmcsa_BroadcastTelevisionMember_1956" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1957" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmedEntertainmentMember" xlink:label="Locator_cmcsa_FilmedEntertainmentMember_1958" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1957" xlink:to="Locator_cmcsa_FilmedEntertainmentMember_1958" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1959" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ThemeParksMember" xlink:label="Locator_cmcsa_ThemeParksMember_1960" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1959" xlink:to="Locator_cmcsa_ThemeParksMember_1960" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_1961" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="Locator_us-gaap_CorporateAndOtherMember_1962" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_1961" xlink:to="Locator_us-gaap_CorporateAndOtherMember_1962" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1963" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_1964" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1963" xlink:to="Locator_us-gaap_BusinessAcquisitionAxis_1964" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_1965" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_1966" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_BusinessAcquisitionAxis_1965" xlink:to="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_1966" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_1967" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherAcquisitionsMember" xlink:label="Locator_cmcsa_OtherAcquisitionsMember_1968" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_1967" xlink:to="Locator_cmcsa_OtherAcquisitionsMember_1968" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1969" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1970" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_1969" xlink:to="Locator_dei_LegalEntityAxis_1970" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_1971" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1972" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_1971" xlink:to="Locator_dei_EntityDomain_1972" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_1973" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_1974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_1973" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_1974" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1975" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod" xlink:label="Locator_us-gaap_GoodwillAcquiredDuringPeriod_1976" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1975" xlink:to="Locator_us-gaap_GoodwillAcquiredDuringPeriod_1976" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1977" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit" xlink:label="Locator_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_1978" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1977" xlink:to="Locator_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_1978" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1979" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillImpairmentLoss" xlink:label="Locator_us-gaap_GoodwillImpairmentLoss_1980" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_1979" xlink:to="Locator_us-gaap_GoodwillImpairmentLoss_1980" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_1981" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_1982" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_1981" xlink:to="Locator_us-gaap_StatementTable_1982" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebtDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2029" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_2030" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2029" xlink:to="Locator_cmcsa_LegalEntity1Axis_2030" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_2057" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_2058" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_2057" xlink:to="Locator_cmcsa_Entity1Domain_2058" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_2059" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2060" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_2059" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2060" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2027" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2027" xlink:to="Locator_us-gaap_DebtInstrumentAxis_2028" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2031" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2032" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_2031" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_2032" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2069" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2070" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_DebtInstrumentAxis_2069" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_2070" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2039" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SeniorNotesWithMaturitiesOf5YearsOrLessMember" xlink:label="Locator_cmcsa_SeniorNotesWithMaturitiesOf5YearsOrLessMember_2040" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2039" xlink:to="Locator_cmcsa_SeniorNotesWithMaturitiesOf5YearsOrLessMember_2040" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2041" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SeniorNotesWithMaturitiesBetween6And10YearsMember" xlink:label="Locator_cmcsa_SeniorNotesWithMaturitiesBetween6And10YearsMember_2042" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2041" xlink:to="Locator_cmcsa_SeniorNotesWithMaturitiesBetween6And10YearsMember_2042" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2043" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SeniorNotesWithMaturitiesGreaterThan10YearsMember" xlink:label="Locator_cmcsa_SeniorNotesWithMaturitiesGreaterThan10YearsMember_2044" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2043" xlink:to="Locator_cmcsa_SeniorNotesWithMaturitiesGreaterThan10YearsMember_2044" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2045" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherIncludingCapitalLeaseObligationsMember" xlink:label="Locator_cmcsa_OtherIncludingCapitalLeaseObligationsMember_2046" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2045" xlink:to="Locator_cmcsa_OtherIncludingCapitalLeaseObligationsMember_2046" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2047" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Notes550Due2029Member" xlink:label="Locator_cmcsa_Notes550Due2029Member_2048" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2047" xlink:to="Locator_cmcsa_Notes550Due2029Member_2048" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2049" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior8875NotesDue2015Member" xlink:label="Locator_cmcsa_Senior8875NotesDue2015Member_2050" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2049" xlink:to="Locator_cmcsa_Senior8875NotesDue2015Member_2050" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2051" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SeniorSubordinated10875NotesDue2016Member" xlink:label="Locator_cmcsa_SeniorSubordinated10875NotesDue2016Member_2052" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2051" xlink:to="Locator_cmcsa_SeniorSubordinated10875NotesDue2016Member_2052" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2035" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="Locator_us-gaap_CommercialPaperMember_2036" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2035" xlink:to="Locator_us-gaap_CommercialPaperMember_2036" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2033" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RevolvingBankCreditFacilityMember" xlink:label="Locator_cmcsa_RevolvingBankCreditFacilityMember_2034" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2033" xlink:to="Locator_cmcsa_RevolvingBankCreditFacilityMember_2034" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2037" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEnterpriseCreditFacilityMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_2038" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2037" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_2038" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2053" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior650NotesDue2015Member" xlink:label="Locator_cmcsa_Senior650NotesDue2015Member_2054" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2053" xlink:to="Locator_cmcsa_Senior650NotesDue2015Member_2054" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2055" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior365NotesDue2015Member" xlink:label="Locator_cmcsa_Senior365NotesDue2015Member_2056" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2055" xlink:to="Locator_cmcsa_Senior365NotesDue2015Member_2056" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2063" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SeniorNotes" xlink:label="Locator_us-gaap_SeniorNotes_2064" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2063" xlink:to="Locator_us-gaap_SeniorNotes_2064" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2065" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherBorrowings" xlink:label="Locator_us-gaap_OtherBorrowings_2066" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2065" xlink:to="Locator_us-gaap_OtherBorrowings_2066" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2067" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtWeightedAverageInterestRate" xlink:label="Locator_us-gaap_DebtWeightedAverageInterestRate_2068" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2067" xlink:to="Locator_us-gaap_DebtWeightedAverageInterestRate_2068" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2061" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCredit" xlink:label="Locator_us-gaap_LineOfCredit_2062" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2061" xlink:to="Locator_us-gaap_LineOfCredit_2062" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2023" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2023" xlink:to="Locator_us-gaap_StatementTable_2024" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebtDebtMaturitiesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2123" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2124" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2123" xlink:to="Locator_us-gaap_DebtInstrumentAxis_2124" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2127" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2128" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_2127" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_2128" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2129" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DueInOneYearMember" xlink:label="Locator_cmcsa_DueInOneYearMember_2130" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2129" xlink:to="Locator_cmcsa_DueInOneYearMember_2130" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2131" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DueInTwoYearsMember" xlink:label="Locator_cmcsa_DueInTwoYearsMember_2132" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2131" xlink:to="Locator_cmcsa_DueInTwoYearsMember_2132" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2133" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DueInThreeYearsMember" xlink:label="Locator_cmcsa_DueInThreeYearsMember_2134" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2133" xlink:to="Locator_cmcsa_DueInThreeYearsMember_2134" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2135" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DueInFourYearsMember" xlink:label="Locator_cmcsa_DueInFourYearsMember_2136" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2135" xlink:to="Locator_cmcsa_DueInFourYearsMember_2136" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2137" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DueInFiveYearsMember" xlink:label="Locator_cmcsa_DueInFiveYearsMember_2138" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2137" xlink:to="Locator_cmcsa_DueInFiveYearsMember_2138" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2139" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ThereafterMember" xlink:label="Locator_cmcsa_ThereafterMember_2140" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2139" xlink:to="Locator_cmcsa_ThereafterMember_2140" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2125" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2126" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2125" xlink:to="Locator_dei_LegalEntityAxis_2126" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2141" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2142" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2141" xlink:to="Locator_dei_EntityDomain_2142" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2143" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2144" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2143" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2144" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2145" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_2146" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2145" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_2146" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2147" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_2148" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2147" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_2148" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2149" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_2150" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2149" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_2150" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2151" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_2152" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2151" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_2152" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2153" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_2154" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2153" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_2154" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2155" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:label="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_2156" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2155" xlink:to="Locator_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_2156" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2119" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2120" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2119" xlink:to="Locator_us-gaap_StatementTable_2120" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/LongTermDebtNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2229" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_2230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2229" xlink:to="Locator_cmcsa_LegalEntity1Axis_2230" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_2251" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_2252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_2251" xlink:to="Locator_cmcsa_Entity1Domain_2252" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_2253" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_2253" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2254" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2225" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2226" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2225" xlink:to="Locator_us-gaap_DebtInstrumentAxis_2226" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2231" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_2231" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_2232" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2233" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherLongTermDebtMember" xlink:label="Locator_cmcsa_OtherLongTermDebtMember_2234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2233" xlink:to="Locator_cmcsa_OtherLongTermDebtMember_2234" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2235" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="Locator_us-gaap_CommercialPaperMember_2236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2235" xlink:to="Locator_us-gaap_CommercialPaperMember_2236" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2237" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior5NotesDue2061Member" xlink:label="Locator_cmcsa_Senior5NotesDue2061Member_2238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2237" xlink:to="Locator_cmcsa_Senior5NotesDue2061Member_2238" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2239" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CurrentYearBorrowingsMember" xlink:label="Locator_cmcsa_CurrentYearBorrowingsMember_2240" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2239" xlink:to="Locator_cmcsa_CurrentYearBorrowingsMember_2240" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2241" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior475NotesDue2044Member" xlink:label="Locator_cmcsa_Senior475NotesDue2044Member_2242" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2241" xlink:to="Locator_cmcsa_Senior475NotesDue2044Member_2242" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2243" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior53NotesDue2014Member" xlink:label="Locator_cmcsa_Senior53NotesDue2014Member_2244" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2243" xlink:to="Locator_cmcsa_Senior53NotesDue2014Member_2244" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2245" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior21NotesDue2014Member" xlink:label="Locator_cmcsa_Senior21NotesDue2014Member_2246" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2245" xlink:to="Locator_cmcsa_Senior21NotesDue2014Member_2246" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2247" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior3375NotesDue2025Member" xlink:label="Locator_cmcsa_Senior3375NotesDue2025Member_2248" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2247" xlink:to="Locator_cmcsa_Senior3375NotesDue2025Member_2248" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2249" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior4200NotesDue2034Member" xlink:label="Locator_cmcsa_Senior4200NotesDue2034Member_2250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2249" xlink:to="Locator_cmcsa_Senior4200NotesDue2034Member_2250" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2227" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2228" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2227" xlink:to="Locator_dei_LegalEntityAxis_2228" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2255" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2255" xlink:to="Locator_dei_EntityDomain_2256" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2257" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastAndComcastCableCommunicationsLlcMember" xlink:label="Locator_cmcsa_ComcastAndComcastCableCommunicationsLlcMember_2258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2257" xlink:to="Locator_cmcsa_ComcastAndComcastCableCommunicationsLlcMember_2258" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2259" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GuaranteeOfIndebtednessOfOthersMember" xlink:label="Locator_us-gaap_GuaranteeOfIndebtednessOfOthersMember_2260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2259" xlink:to="Locator_us-gaap_GuaranteeOfIndebtednessOfOthersMember_2260" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2263" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_UnusedLinesOfCreditMember" xlink:label="Locator_us-gaap_UnusedLinesOfCreditMember_2264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2263" xlink:to="Locator_us-gaap_UnusedLinesOfCreditMember_2264" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2265" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEnterpriseCommercialPaperMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseCommercialPaperMember_2266" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2265" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseCommercialPaperMember_2266" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2267" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastAndComcastCableRevolvingCreditFacilityMember" xlink:label="Locator_cmcsa_ComcastAndComcastCableRevolvingCreditFacilityMember_2268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2267" xlink:to="Locator_cmcsa_ComcastAndComcastCableRevolvingCreditFacilityMember_2268" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2269" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastAndComcastCableDebtSecuritiesMember" xlink:label="Locator_cmcsa_ComcastAndComcastCableDebtSecuritiesMember_2270" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2269" xlink:to="Locator_cmcsa_ComcastAndComcastCableDebtSecuritiesMember_2270" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2271" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEnterpriseCreditFacilityMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_2272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2271" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_2272" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2261" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEnterpriseMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseMember_2262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2261" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseMember_2262" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2273" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtAndCapitalLeaseObligations" xlink:label="Locator_us-gaap_DebtAndCapitalLeaseObligations_2274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2273" xlink:to="Locator_us-gaap_DebtAndCapitalLeaseObligations_2274" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2275" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtFairValue" xlink:label="Locator_us-gaap_LongTermDebtFairValue_2276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2275" xlink:to="Locator_us-gaap_LongTermDebtFairValue_2276" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2277" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="Locator_us-gaap_DebtInstrumentFaceAmount_2278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2277" xlink:to="Locator_us-gaap_DebtInstrumentFaceAmount_2278" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2283" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource" xlink:label="Locator_cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource_2284" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2283" xlink:to="Locator_cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource_2284" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2287" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCredit" xlink:label="Locator_us-gaap_LineOfCredit_2288" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2287" xlink:to="Locator_us-gaap_LineOfCredit_2288" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2291" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="Locator_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_2292" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2291" xlink:to="Locator_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_2292" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2293" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd" xlink:label="Locator_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_2294" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2293" xlink:to="Locator_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_2294" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2295" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfCommercialPaper" xlink:label="Locator_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_2296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2295" xlink:to="Locator_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_2296" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2299" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="Locator_us-gaap_LettersOfCreditOutstandingAmount_2300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2299" xlink:to="Locator_us-gaap_LettersOfCreditOutstandingAmount_2300" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2301" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastOwnershipInCableHoldingCompanySubsidiaries" xlink:label="Locator_cmcsa_ComcastOwnershipInCableHoldingCompanySubsidiaries_2302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2301" xlink:to="Locator_cmcsa_ComcastOwnershipInCableHoldingCompanySubsidiaries_2302" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2303" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommercialPaper" xlink:label="Locator_us-gaap_CommercialPaper_2304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2303" xlink:to="Locator_us-gaap_CommercialPaper_2304" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2305" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_GuaranteeObligationsRevolvingCreditFacility" xlink:label="Locator_cmcsa_GuaranteeObligationsRevolvingCreditFacility_2306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2305" xlink:to="Locator_cmcsa_GuaranteeObligationsRevolvingCreditFacility_2306" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2307" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RelatedPartyAggregatePrincipalAmountSeniorNotesNotSubjectToGuarantee" xlink:label="Locator_cmcsa_RelatedPartyAggregatePrincipalAmountSeniorNotesNotSubjectToGuarantee_2308" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2307" xlink:to="Locator_cmcsa_RelatedPartyAggregatePrincipalAmountSeniorNotesNotSubjectToGuarantee_2308" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2309" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RelatedPartyCreditFacilityNotSubjectToGuarantee" xlink:label="Locator_cmcsa_RelatedPartyCreditFacilityNotSubjectToGuarantee_2310" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2309" xlink:to="Locator_cmcsa_RelatedPartyCreditFacilityNotSubjectToGuarantee_2310" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2311" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RelatedPartyLiquidationPreferencePreferredStockNotSubjectToGuarantee" xlink:label="Locator_cmcsa_RelatedPartyLiquidationPreferencePreferredStockNotSubjectToGuarantee_2312" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2311" xlink:to="Locator_cmcsa_RelatedPartyLiquidationPreferencePreferredStockNotSubjectToGuarantee_2312" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2289" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_GuaranteeObligationsCurrentPrincipalBalance" xlink:label="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_2290" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2289" xlink:to="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_2290" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2285" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockLiquidationPreferenceValue" xlink:label="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_2286" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2285" xlink:to="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_2286" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2297" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="Locator_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_2298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2297" xlink:to="Locator_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_2298" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2221" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2222" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2221" xlink:to="Locator_us-gaap_StatementTable_2222" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2279" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_2280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2279" xlink:to="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_2280" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2281" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" xlink:label="Locator_us-gaap_DebtInstrumentMaturityDateDescription_2282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2281" xlink:to="Locator_us-gaap_DebtInstrumentMaturityDateDescription_2282" order="5.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebtCommercialPaperProgramDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2375" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="Locator_us-gaap_LongtermDebtTypeAxis_2376" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2375" xlink:to="Locator_us-gaap_LongtermDebtTypeAxis_2376" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="Locator_us-gaap_LongtermDebtTypeAxis_2381" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="Locator_us-gaap_LongtermDebtTypeDomain_2382" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_LongtermDebtTypeAxis_2381" xlink:to="Locator_us-gaap_LongtermDebtTypeDomain_2382" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="Locator_us-gaap_LongtermDebtTypeAxis_2395" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="Locator_us-gaap_LongtermDebtTypeDomain_2396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_LongtermDebtTypeAxis_2395" xlink:to="Locator_us-gaap_LongtermDebtTypeDomain_2396" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="Locator_us-gaap_LongtermDebtTypeDomain_2383" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CommercialPaperPriorBorrowingCapacityMember" xlink:label="Locator_cmcsa_CommercialPaperPriorBorrowingCapacityMember_2384" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LongtermDebtTypeDomain_2383" xlink:to="Locator_cmcsa_CommercialPaperPriorBorrowingCapacityMember_2384" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="Locator_us-gaap_LongtermDebtTypeDomain_2385" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CommercialPaperNewBorrowingCapacityMember" xlink:label="Locator_cmcsa_CommercialPaperNewBorrowingCapacityMember_2386" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LongtermDebtTypeDomain_2385" xlink:to="Locator_cmcsa_CommercialPaperNewBorrowingCapacityMember_2386" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2371" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2372" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2371" xlink:to="Locator_us-gaap_DebtInstrumentAxis_2372" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_2377" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2378" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_2377" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_2378" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_2379" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RevolvingBankCreditFacilityMember" xlink:label="Locator_cmcsa_RevolvingBankCreditFacilityMember_2380" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_2379" xlink:to="Locator_cmcsa_RevolvingBankCreditFacilityMember_2380" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2373" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2374" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2373" xlink:to="Locator_dei_LegalEntityAxis_2374" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2387" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2388" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2387" xlink:to="Locator_dei_EntityDomain_2388" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2389" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_2390" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2389" xlink:to="Locator_cmcsa_NbcuniversalMember_2390" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2391" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CommercialPaperToBeIssuedAtAnyOneTimeMaximum" xlink:label="Locator_cmcsa_CommercialPaperToBeIssuedAtAnyOneTimeMaximum_2392" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2391" xlink:to="Locator_cmcsa_CommercialPaperToBeIssuedAtAnyOneTimeMaximum_2392" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2393" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_GuaranteeObligationsCurrentPrincipalBalance" xlink:label="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_2394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2393" xlink:to="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_2394" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2367" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2368" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2367" xlink:to="Locator_us-gaap_StatementTable_2368" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebtRevolvingCreditFacilityDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2423" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="Locator_us-gaap_LineOfCreditFacilityAxis_2424" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2423" xlink:to="Locator_us-gaap_LineOfCreditFacilityAxis_2424" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="Locator_us-gaap_LineOfCreditFacilityAxis_2425" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2426" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_LineOfCreditFacilityAxis_2425" xlink:to="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2426" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityAxis" xlink:label="Locator_us-gaap_LineOfCreditFacilityAxis_2427" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2428" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_LineOfCreditFacilityAxis_2427" xlink:to="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2428" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2429" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RevolvingFacilityMember" xlink:label="Locator_cmcsa_RevolvingFacilityMember_2430" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2429" xlink:to="Locator_cmcsa_RevolvingFacilityMember_2430" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2431" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BaseRateMember" xlink:label="Locator_us-gaap_BaseRateMember_2432" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2431" xlink:to="Locator_us-gaap_BaseRateMember_2432" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2433" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RevolvingCreditFacilityDueJune2017Member" xlink:label="Locator_cmcsa_RevolvingCreditFacilityDueJune2017Member_2434" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2433" xlink:to="Locator_cmcsa_RevolvingCreditFacilityDueJune2017Member_2434" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityLenderDomain" xlink:label="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2435" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="Locator_us-gaap_LineOfCreditMember_2436" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_LineOfCreditFacilityLenderDomain_2435" xlink:to="Locator_us-gaap_LineOfCreditMember_2436" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2437" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2438" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2437" xlink:to="Locator_dei_LegalEntityAxis_2438" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2439" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2440" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2439" xlink:to="Locator_dei_EntityDomain_2440" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2441" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_2442" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2441" xlink:to="Locator_cmcsa_NbcuniversalMember_2442" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2443" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateDescription" xlink:label="Locator_us-gaap_LineOfCreditFacilityInterestRateDescription_2444" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2443" xlink:to="Locator_us-gaap_LineOfCreditFacilityInterestRateDescription_2444" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2445" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DescriptionOfVariableRateDebtBasis" xlink:label="Locator_cmcsa_DescriptionOfVariableRateDebtBasis_2446" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2445" xlink:to="Locator_cmcsa_DescriptionOfVariableRateDebtBasis_2446" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2447" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2448" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2447" xlink:to="Locator_us-gaap_StatementTable_2448" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFairValueMeasurementsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2531" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2532" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2531" xlink:to="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2532" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2533" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2534" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2533" xlink:to="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2534" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2571" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2572" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_FairValueByFairValueHierarchyLevelAxis_2571" xlink:to="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2572" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2535" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="Locator_us-gaap_FairValueInputsLevel1Member_2536" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2535" xlink:to="Locator_us-gaap_FairValueInputsLevel1Member_2536" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2537" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="Locator_us-gaap_FairValueInputsLevel2Member_2538" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2537" xlink:to="Locator_us-gaap_FairValueInputsLevel2Member_2538" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2539" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="Locator_us-gaap_FairValueInputsLevel3Member_2540" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2539" xlink:to="Locator_us-gaap_FairValueInputsLevel3Member_2540" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2541" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TradingSecurities" xlink:label="Locator_us-gaap_TradingSecurities_2542" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2541" xlink:to="Locator_us-gaap_TradingSecurities_2542" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2543" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="Locator_us-gaap_AvailableForSaleSecurities_2544" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2543" xlink:to="Locator_us-gaap_AvailableForSaleSecurities_2544" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2545" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EquityWarrantsFairValueDisclosure" xlink:label="Locator_cmcsa_EquityWarrantsFairValueDisclosure_2546" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2545" xlink:to="Locator_cmcsa_EquityWarrantsFairValueDisclosure_2546" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2547" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InterestRateDerivativeAssetsAtFairValue" xlink:label="Locator_us-gaap_InterestRateDerivativeAssetsAtFairValue_2548" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2547" xlink:to="Locator_us-gaap_InterestRateDerivativeAssetsAtFairValue_2548" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2549" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure" xlink:label="Locator_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_2550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2549" xlink:to="Locator_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_2550" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2551" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherAssetsFairValueDisclosure" xlink:label="Locator_us-gaap_OtherAssetsFairValueDisclosure_2552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2551" xlink:to="Locator_us-gaap_OtherAssetsFairValueDisclosure_2552" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2553" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="Locator_us-gaap_DerivativeFairValueOfDerivativeAsset_2554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2553" xlink:to="Locator_us-gaap_DerivativeFairValueOfDerivativeAsset_2554" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2555" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="Locator_us-gaap_AssetsFairValueDisclosure_2556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2555" xlink:to="Locator_us-gaap_AssetsFairValueDisclosure_2556" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2557" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments" xlink:label="Locator_cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments_2558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2557" xlink:to="Locator_cmcsa_DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments_2558" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2559" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations" xlink:label="Locator_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations_2560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2559" xlink:to="Locator_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations_2560" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2561" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="Locator_us-gaap_BusinessCombinationContingentConsiderationLiability_2562" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2561" xlink:to="Locator_us-gaap_BusinessCombinationContingentConsiderationLiability_2562" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2563" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability" xlink:label="Locator_us-gaap_DerivativeFairValueOfDerivativeLiability_2564" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2563" xlink:to="Locator_us-gaap_DerivativeFairValueOfDerivativeLiability_2564" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2565" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure" xlink:label="Locator_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_2566" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2565" xlink:to="Locator_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_2566" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2567" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherLiabilitiesFairValueDisclosure" xlink:label="Locator_us-gaap_OtherLiabilitiesFairValueDisclosure_2568" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2567" xlink:to="Locator_us-gaap_OtherLiabilitiesFairValueDisclosure_2568" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2569" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="Locator_us-gaap_LiabilitiesFairValueDisclosure_2570" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2569" xlink:to="Locator_us-gaap_LiabilitiesFairValueDisclosure_2570" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2501" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2502" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2501" xlink:to="Locator_us-gaap_StatementTable_2502" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureNoncontrollingInterestsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2593" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2594" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2593" xlink:to="Locator_dei_LegalEntityAxis_2594" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2595" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2596" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2595" xlink:to="Locator_dei_EntityDomain_2596" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2597" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedemptionTransactionMember" xlink:label="Locator_cmcsa_RedemptionTransactionMember_2598" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2597" xlink:to="Locator_cmcsa_RedemptionTransactionMember_2598" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2599" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherPurchaseMember" xlink:label="Locator_cmcsa_OtherPurchaseMember_2600" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2599" xlink:to="Locator_cmcsa_OtherPurchaseMember_2600" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2601" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IncreaseInAdditionalPaidInCapitalFromIssuanceOfNoncontrollingEquityInterest" xlink:label="Locator_cmcsa_IncreaseInAdditionalPaidInCapitalFromIssuanceOfNoncontrollingEquityInterest_2602" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2601" xlink:to="Locator_cmcsa_IncreaseInAdditionalPaidInCapitalFromIssuanceOfNoncontrollingEquityInterest_2602" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2603" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IncreaseInAdditionalPaidInCapitalResultingFromPurchaseOfNoncontrollingInterest" xlink:label="Locator_cmcsa_IncreaseInAdditionalPaidInCapitalResultingFromPurchaseOfNoncontrollingInterest_2604" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2603" xlink:to="Locator_cmcsa_IncreaseInAdditionalPaidInCapitalResultingFromPurchaseOfNoncontrollingInterest_2604" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2605" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ChangesFromNetIncomeAttributableToParent" xlink:label="Locator_cmcsa_ChangesFromNetIncomeAttributableToParent_2606" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2605" xlink:to="Locator_cmcsa_ChangesFromNetIncomeAttributableToParent_2606" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2607" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncontrollingInterestAcquired" xlink:label="Locator_cmcsa_NoncontrollingInterestAcquired_2608" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2607" xlink:to="Locator_cmcsa_NoncontrollingInterestAcquired_2608" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2609" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2610" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2609" xlink:to="Locator_us-gaap_StatementTable_2610" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2639" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2639" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2640" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2641" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2641" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_2642" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2643" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2644" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2643" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_2644" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2645" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RetirementInvestmentPlansMember" xlink:label="Locator_cmcsa_RetirementInvestmentPlansMember_2646" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2645" xlink:to="Locator_cmcsa_RetirementInvestmentPlansMember_2646" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2647" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DeferredCompensationPlansMember" xlink:label="Locator_cmcsa_DeferredCompensationPlansMember_2648" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2647" xlink:to="Locator_cmcsa_DeferredCompensationPlansMember_2648" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2649" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2650" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2649" xlink:to="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2650" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2651" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_PensionPlansDefinedBenefitMember_2652" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2651" xlink:to="Locator_us-gaap_PensionPlansDefinedBenefitMember_2652" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2653" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2654" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2653" xlink:to="Locator_dei_LegalEntityAxis_2654" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2655" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2656" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2655" xlink:to="Locator_dei_EntityDomain_2656" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2657" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2658" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2657" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2658" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2659" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MaximumContributionRequiredToFullyFundAndSettlePensionPlan" xlink:label="Locator_cmcsa_MaximumContributionRequiredToFullyFundAndSettlePensionPlan_2660" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2659" xlink:to="Locator_cmcsa_MaximumContributionRequiredToFullyFundAndSettlePensionPlan_2660" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2661" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MultiemployerPlanPeriodContributions" xlink:label="Locator_us-gaap_MultiemployerPlanPeriodContributions_2662" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2661" xlink:to="Locator_us-gaap_MultiemployerPlanPeriodContributions_2662" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2663" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CashSurrenderValueOfLifeInsurance" xlink:label="Locator_us-gaap_CashSurrenderValueOfLifeInsurance_2664" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2663" xlink:to="Locator_us-gaap_CashSurrenderValueOfLifeInsurance_2664" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2665" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized" xlink:label="Locator_us-gaap_DefinedContributionPlanCostRecognized_2666" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2665" xlink:to="Locator_us-gaap_DefinedContributionPlanCostRecognized_2666" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2667" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SeveranceCosts1" xlink:label="Locator_us-gaap_SeveranceCosts1_2668" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2667" xlink:to="Locator_us-gaap_SeveranceCosts1_2668" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2669" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MultiemployerPlansFundedStatus" xlink:label="Locator_us-gaap_MultiemployerPlansFundedStatus_2670" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2669" xlink:to="Locator_us-gaap_MultiemployerPlansFundedStatus_2670" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2671" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets" xlink:label="Locator_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_2672" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2671" xlink:to="Locator_us-gaap_DefinedBenefitPlanPlansWithBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_2672" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2673" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="Locator_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_2674" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2673" xlink:to="Locator_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_2674" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2675" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2676" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2675" xlink:to="Locator_us-gaap_StatementTable_2676" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsInformationOnOurPensionBenefitPlansDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2719" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RangeAxis" xlink:label="Locator_us-gaap_RangeAxis_2720" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2719" xlink:to="Locator_us-gaap_RangeAxis_2720" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RangeAxis" xlink:label="Locator_us-gaap_RangeAxis_2723" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RangeDomain" xlink:label="Locator_cmcsa_RangeDomain_2724" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_RangeAxis_2723" xlink:to="Locator_cmcsa_RangeDomain_2724" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RangeAxis" xlink:label="Locator_us-gaap_RangeAxis_2753" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RangeDomain" xlink:label="Locator_cmcsa_RangeDomain_2754" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_RangeAxis_2753" xlink:to="Locator_cmcsa_RangeDomain_2754" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RangeDomain" xlink:label="Locator_cmcsa_RangeDomain_2735" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinimumMember" xlink:label="Locator_us-gaap_MinimumMember_2736" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_RangeDomain_2735" xlink:to="Locator_us-gaap_MinimumMember_2736" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RangeDomain" xlink:label="Locator_cmcsa_RangeDomain_2737" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MaximumMember" xlink:label="Locator_us-gaap_MaximumMember_2738" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_RangeDomain_2737" xlink:to="Locator_us-gaap_MaximumMember_2738" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2717" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2718" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2717" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2718" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2725" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2726" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2725" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_2726" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2729" xlink:to="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2730" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2727" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_PensionPlansDefinedBenefitMember_2728" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2727" xlink:to="Locator_us-gaap_PensionPlansDefinedBenefitMember_2728" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2721" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2722" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2721" xlink:to="Locator_dei_LegalEntityAxis_2722" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2731" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2732" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2731" xlink:to="Locator_dei_EntityDomain_2732" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2733" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2734" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2733" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2734" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2739" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation" xlink:label="Locator_us-gaap_DefinedBenefitPlanBenefitObligation_2740" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2739" xlink:to="Locator_us-gaap_DefinedBenefitPlanBenefitObligation_2740" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2741" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets" xlink:label="Locator_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_2742" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2741" xlink:to="Locator_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_2742" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2743" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan" xlink:label="Locator_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_2744" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2743" xlink:to="Locator_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_2744" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2745" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax" xlink:label="Locator_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_2746" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2745" xlink:to="Locator_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_2746" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2747" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitExpense" xlink:label="Locator_us-gaap_PensionAndOtherPostretirementBenefitExpense_2748" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2747" xlink:to="Locator_us-gaap_PensionAndOtherPostretirementBenefitExpense_2748" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2749" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate" xlink:label="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_2750" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2749" xlink:to="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_2750" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2751" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_2752" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2751" xlink:to="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_2752" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2713" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2714" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2713" xlink:to="Locator_us-gaap_StatementTable_2714" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsDeferredCompensationPlansDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2783" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2783" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2784" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2785" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2786" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_2785" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_2786" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_2787" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DeferredCompensationPlansMember" xlink:label="Locator_cmcsa_DeferredCompensationPlansMember_2788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_2787" xlink:to="Locator_cmcsa_DeferredCompensationPlansMember_2788" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2789" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2789" xlink:to="Locator_dei_LegalEntityAxis_2790" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2791" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2791" xlink:to="Locator_dei_EntityDomain_2792" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2793" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2793" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2794" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2795" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DeferredCompensationPlansBenefitObligation" xlink:label="Locator_cmcsa_DeferredCompensationPlansBenefitObligation_2796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2795" xlink:to="Locator_cmcsa_DeferredCompensationPlansBenefitObligation_2796" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2797" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DeferredCompensationPlansInterestCost" xlink:label="Locator_cmcsa_DeferredCompensationPlansInterestCost_2798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2797" xlink:to="Locator_cmcsa_DeferredCompensationPlansInterestCost_2798" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2799" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2799" xlink:to="Locator_us-gaap_StatementTable_2800" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquityNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2839" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="Locator_us-gaap_ShareRepurchaseProgramAxis_2840" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2839" xlink:to="Locator_us-gaap_ShareRepurchaseProgramAxis_2840" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="Locator_us-gaap_ShareRepurchaseProgramAxis_2841" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="Locator_us-gaap_ShareRepurchaseProgramDomain_2842" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ShareRepurchaseProgramAxis_2841" xlink:to="Locator_us-gaap_ShareRepurchaseProgramDomain_2842" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis" xlink:label="Locator_us-gaap_ShareRepurchaseProgramAxis_2865" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="Locator_us-gaap_ShareRepurchaseProgramDomain_2866" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_ShareRepurchaseProgramAxis_2865" xlink:to="Locator_us-gaap_ShareRepurchaseProgramDomain_2866" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="Locator_us-gaap_ShareRepurchaseProgramDomain_2843" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ExistingAuthorizationMember" xlink:label="Locator_cmcsa_ExistingAuthorizationMember_2844" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareRepurchaseProgramDomain_2843" xlink:to="Locator_cmcsa_ExistingAuthorizationMember_2844" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain" xlink:label="Locator_us-gaap_ShareRepurchaseProgramDomain_2845" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NewAuthorizationMember" xlink:label="Locator_cmcsa_NewAuthorizationMember_2846" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareRepurchaseProgramDomain_2845" xlink:to="Locator_cmcsa_NewAuthorizationMember_2846" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2835" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_2836" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2835" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_2836" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_2847" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2848" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_2847" xlink:to="Locator_us-gaap_ClassOfStockDomain_2848" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2849" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_2850" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2849" xlink:to="Locator_us-gaap_CommonClassAMember_2850" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2851" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_2852" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2851" xlink:to="Locator_us-gaap_CommonClassBMember_2852" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2837" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2838" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2837" xlink:to="Locator_dei_LegalEntityAxis_2838" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2853" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2854" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2853" xlink:to="Locator_dei_EntityDomain_2854" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2855" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2856" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2855" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2856" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2857" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CommonStockVotingPower" xlink:label="Locator_cmcsa_CommonStockVotingPower_2858" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2857" xlink:to="Locator_cmcsa_CommonStockVotingPower_2858" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2859" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock" xlink:label="Locator_cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock_2860" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2859" xlink:to="Locator_cmcsa_NumberOfVotesEntitledOfEachClassBCommonStock_2860" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2861" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1" xlink:label="Locator_us-gaap_StockRepurchaseProgramAuthorizedAmount1_2862" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2861" xlink:to="Locator_us-gaap_StockRepurchaseProgramAuthorizedAmount1_2862" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2863" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1" xlink:label="Locator_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_2864" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2863" xlink:to="Locator_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_2864" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2825" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2826" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2825" xlink:to="Locator_us-gaap_StatementTable_2826" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquityChangesInCommonStockDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2899" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_2900" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2899" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_2900" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_2901" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2902" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_2901" xlink:to="Locator_us-gaap_ClassOfStockDomain_2902" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2903" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_2904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2903" xlink:to="Locator_us-gaap_CommonClassAMember_2904" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2905" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_2906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2905" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_2906" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_2907" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_2908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_2907" xlink:to="Locator_us-gaap_CommonClassBMember_2908" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2909" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_2910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2909" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_2910" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2911" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" xlink:label="Locator_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_2912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2911" xlink:to="Locator_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_2912" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2913" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans" xlink:label="Locator_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_2914" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2913" xlink:to="Locator_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_2914" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2915" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ShareExchangeIssuedReceived" xlink:label="Locator_cmcsa_ShareExchangeIssuedReceived_2916" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2915" xlink:to="Locator_cmcsa_ShareExchangeIssuedReceived_2916" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2917" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2918" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2917" xlink:to="Locator_us-gaap_StatementTable_2918" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquityComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2933" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2934" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2933" xlink:to="Locator_dei_LegalEntityAxis_2934" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2935" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2936" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2935" xlink:to="Locator_dei_EntityDomain_2936" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2937" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2938" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2937" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2938" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2939" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2940" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2939" xlink:to="Locator_us-gaap_StatementTable_2940" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationRecognizedShareBasedCompensationExpenseDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2955" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2956" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2955" xlink:to="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2956" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2957" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_2958" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_2957" xlink:to="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_2958" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_2959" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="Locator_us-gaap_EmployeeStockMember_2960" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_2959" xlink:to="Locator_us-gaap_EmployeeStockMember_2960" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_2961" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="Locator_us-gaap_EmployeeStockOptionMember_2962" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_2961" xlink:to="Locator_us-gaap_EmployeeStockOptionMember_2962" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_2963" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="Locator_us-gaap_RestrictedStockMember_2964" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_2963" xlink:to="Locator_us-gaap_RestrictedStockMember_2964" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2965" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2966" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_2965" xlink:to="Locator_dei_LegalEntityAxis_2966" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_2967" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2968" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_2967" xlink:to="Locator_dei_EntityDomain_2968" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_2969" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_2970" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_2969" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_2970" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2971" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="Locator_us-gaap_AllocatedShareBasedCompensationExpense_2972" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2971" xlink:to="Locator_us-gaap_AllocatedShareBasedCompensationExpense_2972" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2973" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="Locator_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_2973" xlink:to="Locator_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2974" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_2975" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_2976" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_2975" xlink:to="Locator_us-gaap_StatementTable_2976" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationRestrictedShareUnitsAndStockOptionFairValueDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3009" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3010" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3009" xlink:to="Locator_dei_LegalEntityAxis_3010" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3011" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3012" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3011" xlink:to="Locator_dei_EntityDomain_3012" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3013" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3014" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3013" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3014" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3015" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3016" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3015" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3016" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3017" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_3018" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3017" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_3018" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3019" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_3020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3019" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_3020" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3021" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_3022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3021" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_3022" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3023" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="Locator_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_3024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3023" xlink:to="Locator_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_3024" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3025" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3025" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3026" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3027" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3027" xlink:to="Locator_us-gaap_StatementTable_3028" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationStockOptionsAndRestrictedShareUnitsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3055" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_3056" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3055" xlink:to="Locator_us-gaap_AwardTypeAxis_3056" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_3057" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3058" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_AwardTypeAxis_3057" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3058" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="Locator_us-gaap_AwardTypeAxis_3059" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3060" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_AwardTypeAxis_3059" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3060" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3061" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NetSettledOptionsMember" xlink:label="Locator_cmcsa_NetSettledOptionsMember_3062" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3061" xlink:to="Locator_cmcsa_NetSettledOptionsMember_3062" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3063" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_3064" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3063" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_3064" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3065" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_3066" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3065" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_3066" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3067" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_3068" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3067" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_3068" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3069" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3070" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3069" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_3070" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3071" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3072" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3071" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_3072" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3073" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3074" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3073" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3074" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3075" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3076" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3075" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_3076" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3077" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3078" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3077" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3078" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3079" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3080" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3079" xlink:to="Locator_us-gaap_StatementTable_3080" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesComponentsOfIncomeTaxExpenseDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3115" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3116" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3115" xlink:to="Locator_dei_LegalEntityAxis_3116" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3117" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3118" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3117" xlink:to="Locator_dei_EntityDomain_3118" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3119" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3120" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3119" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3120" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3121" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CurrentFederalTaxExpenseBenefit" xlink:label="Locator_us-gaap_CurrentFederalTaxExpenseBenefit_3122" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3121" xlink:to="Locator_us-gaap_CurrentFederalTaxExpenseBenefit_3122" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3123" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit" xlink:label="Locator_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_3124" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3123" xlink:to="Locator_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_3124" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3125" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit" xlink:label="Locator_us-gaap_CurrentForeignTaxExpenseBenefit_3126" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3125" xlink:to="Locator_us-gaap_CurrentForeignTaxExpenseBenefit_3126" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3127" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_CurrentIncomeTaxExpenseBenefit_3128" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3127" xlink:to="Locator_us-gaap_CurrentIncomeTaxExpenseBenefit_3128" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3129" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_3130" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3129" xlink:to="Locator_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_3130" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3131" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_3132" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3131" xlink:to="Locator_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_3132" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3133" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_3134" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3133" xlink:to="Locator_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_3134" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3135" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_StateAndLocalTaxExpenseBenefit" xlink:label="Locator_cmcsa_StateAndLocalTaxExpenseBenefit_3136" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3135" xlink:to="Locator_cmcsa_StateAndLocalTaxExpenseBenefit_3136" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3137" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_WithholdingTaxExpense" xlink:label="Locator_cmcsa_WithholdingTaxExpense_3138" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3137" xlink:to="Locator_cmcsa_WithholdingTaxExpense_3138" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3139" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3140" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3139" xlink:to="Locator_us-gaap_StatementTable_3140" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesFederalStatutoryDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3163" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_3164" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3163" xlink:to="Locator_cmcsa_TaxAdjustmentsAxis_3164" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_3165" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3166" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_TaxAdjustmentsAxis_3165" xlink:to="Locator_cmcsa_TaxAdjustmentsDomain_3166" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3167" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_UncertainAndEffectivelySettledTaxPositionsNetMember" xlink:label="Locator_cmcsa_UncertainAndEffectivelySettledTaxPositionsNetMember_3168" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_3167" xlink:to="Locator_cmcsa_UncertainAndEffectivelySettledTaxPositionsNetMember_3168" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3169" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember" xlink:label="Locator_cmcsa_AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember_3170" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_3169" xlink:to="Locator_cmcsa_AccruedInterestOnUncertainAndEffectivelySettledTaxPositionsNetMember_3170" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3171" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:label="Locator_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_3172" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3171" xlink:to="Locator_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_3172" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3173" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes" xlink:label="Locator_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_3174" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3173" xlink:to="Locator_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_3174" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3175" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential" xlink:label="Locator_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_3176" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3175" xlink:to="Locator_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_3176" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3177" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense" xlink:label="Locator_us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense_3178" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3177" xlink:to="Locator_us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense_3178" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3179" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations" xlink:label="Locator_cmcsa_IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations_3180" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3179" xlink:to="Locator_cmcsa_IncomeTaxReconciliationBenefitRelatedToCertainSubsidiaryReorganizations_3180" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3181" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments" xlink:label="Locator_us-gaap_IncomeTaxReconciliationOtherAdjustments_3182" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3181" xlink:to="Locator_us-gaap_IncomeTaxReconciliationOtherAdjustments_3182" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3183" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3184" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3183" xlink:to="Locator_us-gaap_StatementTable_3184" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesComponentsOfNetDeferredTaxLiabilityDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3227" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_3228" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3227" xlink:to="Locator_cmcsa_TaxAdjustmentsAxis_3228" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_3229" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_TaxAdjustmentsAxis_3229" xlink:to="Locator_cmcsa_TaxAdjustmentsDomain_3230" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3231" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PropertyAndEquipmentAndIntangibleAssetsMember" xlink:label="Locator_cmcsa_PropertyAndEquipmentAndIntangibleAssetsMember_3232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_3231" xlink:to="Locator_cmcsa_PropertyAndEquipmentAndIntangibleAssetsMember_3232" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3233" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentsMember" xlink:label="Locator_us-gaap_InvestmentsMember_3234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_3233" xlink:to="Locator_us-gaap_InvestmentsMember_3234" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3235" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IndexedDebtSecuritiesMember" xlink:label="Locator_cmcsa_IndexedDebtSecuritiesMember_3236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_3235" xlink:to="Locator_cmcsa_IndexedDebtSecuritiesMember_3236" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3237" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ForeignSubsidiariesAndUndistributedForeignEarningsMember" xlink:label="Locator_cmcsa_ForeignSubsidiariesAndUndistributedForeignEarningsMember_3238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_3237" xlink:to="Locator_cmcsa_ForeignSubsidiariesAndUndistributedForeignEarningsMember_3238" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_3239" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DifferencesBetweenBookAndTaxOutsideBasisOfNbcuniversalMember" xlink:label="Locator_cmcsa_DifferencesBetweenBookAndTaxOutsideBasisOfNbcuniversalMember_3240" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_3239" xlink:to="Locator_cmcsa_DifferencesBetweenBookAndTaxOutsideBasisOfNbcuniversalMember_3240" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3241" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3242" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3241" xlink:to="Locator_dei_LegalEntityAxis_3242" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3243" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3244" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3243" xlink:to="Locator_dei_EntityDomain_3244" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3245" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_3246" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3245" xlink:to="Locator_cmcsa_NbcuniversalMember_3246" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3247" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="Locator_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_3248" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3247" xlink:to="Locator_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_3248" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3249" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsOther" xlink:label="Locator_us-gaap_DeferredTaxAssetsOther_3250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3249" xlink:to="Locator_us-gaap_DeferredTaxAssetsOther_3250" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3251" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther" xlink:label="Locator_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_3252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3251" xlink:to="Locator_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_3252" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3253" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance" xlink:label="Locator_us-gaap_DeferredTaxAssetsValuationAllowance_3254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3253" xlink:to="Locator_us-gaap_DeferredTaxAssetsValuationAllowance_3254" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3255" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxAssetsNet" xlink:label="Locator_us-gaap_DeferredTaxAssetsNet_3256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3255" xlink:to="Locator_us-gaap_DeferredTaxAssetsNet_3256" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3257" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther" xlink:label="Locator_us-gaap_DeferredTaxLiabilitiesOther_3258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3257" xlink:to="Locator_us-gaap_DeferredTaxLiabilitiesOther_3258" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3259" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilities" xlink:label="Locator_us-gaap_DeferredIncomeTaxLiabilities_3260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3259" xlink:to="Locator_us-gaap_DeferredIncomeTaxLiabilities_3260" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="Locator_us-gaap_DeferredTaxLiabilities_3262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3261" xlink:to="Locator_us-gaap_DeferredTaxLiabilities_3262" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3263" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3263" xlink:to="Locator_us-gaap_StatementTable_3264" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationNoncashInvestingAndFinancingActivitiesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3329" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3330" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3329" xlink:to="Locator_cmcsa_LegalEntity1Axis_3330" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3331" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3332" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_3331" xlink:to="Locator_cmcsa_Entity1Domain_3332" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3333" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3334" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_3333" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3334" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3327" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3328" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3327" xlink:to="Locator_dei_LegalEntityAxis_3328" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3335" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3336" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3335" xlink:to="Locator_dei_EntityDomain_3336" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3337" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="Locator_us-gaap_RevolvingCreditFacilityMember_3338" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3337" xlink:to="Locator_us-gaap_RevolvingCreditFacilityMember_3338" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3339" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="Locator_us-gaap_SeniorNotesMember_3340" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3339" xlink:to="Locator_us-gaap_SeniorNotesMember_3340" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3341" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="Locator_us-gaap_PreferredStockMember_3342" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3341" xlink:to="Locator_us-gaap_PreferredStockMember_3342" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3347" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent" xlink:label="Locator_us-gaap_DividendsPayableCurrentAndNoncurrent_3348" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3347" xlink:to="Locator_us-gaap_DividendsPayableCurrentAndNoncurrent_3348" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3349" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DividendsPayableAmountPerShare" xlink:label="Locator_us-gaap_DividendsPayableAmountPerShare_3350" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3349" xlink:to="Locator_us-gaap_DividendsPayableAmountPerShare_3350" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3351" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="Locator_us-gaap_CapitalExpendituresIncurredButNotYetPaid_3352" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3351" xlink:to="Locator_us-gaap_CapitalExpendituresIncurredButNotYetPaid_3352" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3353" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1" xlink:label="Locator_us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1_3354" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3353" xlink:to="Locator_us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1_3354" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3355" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueEquitySecuritiesSettlement" xlink:label="Locator_cmcsa_FairValueEquitySecuritiesSettlement_3356" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3355" xlink:to="Locator_cmcsa_FairValueEquitySecuritiesSettlement_3356" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3357" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncashConsiderationTransferredInPurchaseOfBuilding" xlink:label="Locator_cmcsa_NoncashConsiderationTransferredInPurchaseOfBuilding_3358" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3357" xlink:to="Locator_cmcsa_NoncashConsiderationTransferredInPurchaseOfBuilding_3358" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3359" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CapitalContributionAccruedButNotYetPaid" xlink:label="Locator_cmcsa_CapitalContributionAccruedButNotYetPaid_3360" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3359" xlink:to="Locator_cmcsa_CapitalContributionAccruedButNotYetPaid_3360" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3343" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncontrollingInterestAcquired" xlink:label="Locator_cmcsa_NoncontrollingInterestAcquired_3344" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3343" xlink:to="Locator_cmcsa_NoncontrollingInterestAcquired_3344" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3345" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockLiquidationPreferenceValue" xlink:label="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_3346" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3345" xlink:to="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_3346" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3323" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3323" xlink:to="Locator_us-gaap_StatementTable_3324" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3401" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3402" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3401" xlink:to="Locator_cmcsa_LegalEntity1Axis_3402" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3403" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3404" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_3403" xlink:to="Locator_cmcsa_Entity1Domain_3404" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3405" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3406" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_3405" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3406" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3407" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NumberOfCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear" xlink:label="Locator_cmcsa_NumberOfCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear_3408" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3407" xlink:to="Locator_cmcsa_NumberOfCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear_3408" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3409" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements" xlink:label="Locator_cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements_3410" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3409" xlink:to="Locator_cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreements_3410" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3411" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear" xlink:label="Locator_cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear_3412" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3411" xlink:to="Locator_cmcsa_NumberOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduleToExpireByEndOfYear_3412" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3413" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear" xlink:label="Locator_cmcsa_PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear_3414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3413" xlink:to="Locator_cmcsa_PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear_3414" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3415" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SubsequentFairValueAdjustments" xlink:label="Locator_cmcsa_SubsequentFairValueAdjustments_3416" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3415" xlink:to="Locator_cmcsa_SubsequentFairValueAdjustments_3416" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3417" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EquityInterestPercentage" xlink:label="Locator_cmcsa_EquityInterestPercentage_3418" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3417" xlink:to="Locator_cmcsa_EquityInterestPercentage_3418" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3419" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_VotingInterestPercentage" xlink:label="Locator_cmcsa_VotingInterestPercentage_3420" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3419" xlink:to="Locator_cmcsa_VotingInterestPercentage_3420" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3421" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DebtOfUnconsolidatedVie" xlink:label="Locator_cmcsa_DebtOfUnconsolidatedVie_3422" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3421" xlink:to="Locator_cmcsa_DebtOfUnconsolidatedVie_3422" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3423" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DebtInstrumentMaturityPeriod" xlink:label="Locator_cmcsa_DebtInstrumentMaturityPeriod_3424" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3423" xlink:to="Locator_cmcsa_DebtInstrumentMaturityPeriod_3424" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3425" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CashPaidForSettlementOfCollateralLiability" xlink:label="Locator_cmcsa_CashPaidForSettlementOfCollateralLiability_3426" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3425" xlink:to="Locator_cmcsa_CashPaidForSettlementOfCollateralLiability_3426" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3427" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt" xlink:label="Locator_cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt_3428" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3427" xlink:to="Locator_cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt_3428" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3429" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3430" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3429" xlink:to="Locator_us-gaap_StatementTable_3430" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CommitmentsAndContingenciesMinimumAnnualCommitmentsUnderTheProgrammingLicenseAgreementsAndOperatingLeasesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3467" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3468" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3467" xlink:to="Locator_cmcsa_LegalEntity1Axis_3468" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_LegalEntity1Axis" xlink:label="Locator_cmcsa_LegalEntity1Axis_3469" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3470" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_LegalEntity1Axis_3469" xlink:to="Locator_cmcsa_Entity1Domain_3470" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Entity1Domain" xlink:label="Locator_cmcsa_Entity1Domain_3471" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3472" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_Entity1Domain_3471" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3472" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3473" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsCurrent" xlink:label="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsCurrent_3474" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3473" xlink:to="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsCurrent_3474" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3475" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInTwoYears" xlink:label="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInTwoYears_3476" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3475" xlink:to="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInTwoYears_3476" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3477" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInThreeYears" xlink:label="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInThreeYears_3478" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3477" xlink:to="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInThreeYears_3478" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3479" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInFourYears" xlink:label="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInFourYears_3480" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3479" xlink:to="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInFourYears_3480" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3481" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInFiveYears" xlink:label="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInFiveYears_3482" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3481" xlink:to="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsInFiveYears_3482" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3483" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsDueThereafter" xlink:label="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsDueThereafter_3484" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3483" xlink:to="Locator_cmcsa_ProgrammingAndTalentCommitmentsFutureMinimumPaymentsDueThereafter_3484" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3485" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_3486" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3485" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_3486" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3487" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_3488" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3487" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_3488" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3489" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3490" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3489" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3490" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3491" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_3492" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3491" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_3492" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3493" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_3494" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3493" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_3494" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3495" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3496" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3495" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_3496" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3497" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3498" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3497" xlink:to="Locator_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_3498" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3499" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3500" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3499" xlink:to="Locator_us-gaap_StatementTable_3500" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesRentalExpenseDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3513" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3513" xlink:to="Locator_dei_LegalEntityAxis_3514" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3515" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3516" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3515" xlink:to="Locator_dei_EntityDomain_3516" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3517" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3517" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3518" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3519" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LeaseAndRentalExpense" xlink:label="Locator_us-gaap_LeaseAndRentalExpense_3520" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3519" xlink:to="Locator_us-gaap_LeaseAndRentalExpense_3520" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3521" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3522" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3521" xlink:to="Locator_us-gaap_StatementTable_3522" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegmentDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3555" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="Locator_us-gaap_StatementGeographicalAxis_3556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3555" xlink:to="Locator_us-gaap_StatementGeographicalAxis_3556" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="Locator_us-gaap_StatementGeographicalAxis_3561" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="Locator_us-gaap_SegmentGeographicalDomain_3562" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementGeographicalAxis_3561" xlink:to="Locator_us-gaap_SegmentGeographicalDomain_3562" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="Locator_us-gaap_StatementGeographicalAxis_3631" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="Locator_us-gaap_SegmentGeographicalDomain_3632" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_StatementGeographicalAxis_3631" xlink:to="Locator_us-gaap_SegmentGeographicalDomain_3632" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="Locator_us-gaap_SegmentGeographicalDomain_3563" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NonUSCustomersMember" xlink:label="Locator_cmcsa_NonUSCustomersMember_3564" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentGeographicalDomain_3563" xlink:to="Locator_cmcsa_NonUSCustomersMember_3564" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="Locator_us-gaap_SegmentGeographicalDomain_3565" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_UnitedStatesMember" xlink:label="Locator_cmcsa_UnitedStatesMember_3566" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentGeographicalDomain_3565" xlink:to="Locator_cmcsa_UnitedStatesMember_3566" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3559" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3559" xlink:to="Locator_us-gaap_ConsolidationItemsAxis_3560" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3567" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3568" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3567" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3568" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3633" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3633" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3634" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3569" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="Locator_us-gaap_OperatingSegmentsMember_3570" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3569" xlink:to="Locator_us-gaap_OperatingSegmentsMember_3570" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3571" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CorporateMember" xlink:label="Locator_us-gaap_CorporateMember_3572" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3571" xlink:to="Locator_us-gaap_CorporateMember_3572" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3573" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IntersegmentEliminationMember" xlink:label="Locator_us-gaap_IntersegmentEliminationMember_3574" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3573" xlink:to="Locator_us-gaap_IntersegmentEliminationMember_3574" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3553" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_3554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3553" xlink:to="Locator_us-gaap_StatementBusinessSegmentsAxis_3554" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_3575" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3576" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementBusinessSegmentsAxis_3575" xlink:to="Locator_us-gaap_SegmentDomain_3576" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_3635" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_StatementBusinessSegmentsAxis_3635" xlink:to="Locator_us-gaap_SegmentDomain_3636" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3577" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsMember" xlink:label="Locator_cmcsa_CableCommunicationsMember_3578" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3577" xlink:to="Locator_cmcsa_CableCommunicationsMember_3578" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3579" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableNetworksMember" xlink:label="Locator_cmcsa_CableNetworksMember_3580" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3579" xlink:to="Locator_cmcsa_CableNetworksMember_3580" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3581" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_BroadcastTelevisionMember" xlink:label="Locator_cmcsa_BroadcastTelevisionMember_3582" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3581" xlink:to="Locator_cmcsa_BroadcastTelevisionMember_3582" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3583" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmedEntertainmentMember" xlink:label="Locator_cmcsa_FilmedEntertainmentMember_3584" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3583" xlink:to="Locator_cmcsa_FilmedEntertainmentMember_3584" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3585" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ThemeParksMember" xlink:label="Locator_cmcsa_ThemeParksMember_3586" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3585" xlink:to="Locator_cmcsa_ThemeParksMember_3586" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3587" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_HeadquartersAndOtherMember" xlink:label="Locator_cmcsa_HeadquartersAndOtherMember_3588" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3587" xlink:to="Locator_cmcsa_HeadquartersAndOtherMember_3588" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3589" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEliminationsMember" xlink:label="Locator_cmcsa_NbcuniversalEliminationsMember_3590" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3589" xlink:to="Locator_cmcsa_NbcuniversalEliminationsMember_3590" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3591" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_3592" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3591" xlink:to="Locator_cmcsa_NbcuniversalMember_3592" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3593" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CorporateAndOtherMember" xlink:label="Locator_us-gaap_CorporateAndOtherMember_3594" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3593" xlink:to="Locator_us-gaap_CorporateAndOtherMember_3594" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3595" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EliminationsMember" xlink:label="Locator_cmcsa_EliminationsMember_3596" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3595" xlink:to="Locator_cmcsa_EliminationsMember_3596" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3597" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageVideoMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageVideoMember_3598" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3597" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageVideoMember_3598" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3599" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageHighSpeedInternetMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageHighSpeedInternetMember_3600" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3599" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageHighSpeedInternetMember_3600" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3601" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageVoiceMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageVoiceMember_3602" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3601" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageVoiceMember_3602" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3603" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageBusinessServicesMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageBusinessServicesMember_3604" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3603" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageBusinessServicesMember_3604" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3605" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageAdvertisingMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageAdvertisingMember_3606" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3605" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageAdvertisingMember_3606" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3607" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageOtherMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageOtherMember_3608" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3607" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageOtherMember_3608" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_3609" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsSegmentRevenuePercentageFranchiseFeesMember" xlink:label="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageFranchiseFeesMember_3610" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_3609" xlink:to="Locator_cmcsa_CableCommunicationsSegmentRevenuePercentageFranchiseFeesMember_3610" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3557" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3557" xlink:to="Locator_dei_LegalEntityAxis_3558" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3611" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3612" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3611" xlink:to="Locator_dei_EntityDomain_3612" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3613" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_3614" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3613" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_3614" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3617" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OperatingIncomeExcludingDepreciationAndAmortization" xlink:label="Locator_cmcsa_OperatingIncomeExcludingDepreciationAndAmortization_3618" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3617" xlink:to="Locator_cmcsa_OperatingIncomeExcludingDepreciationAndAmortization_3618" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3619" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="Locator_us-gaap_DepreciationAndAmortization_3620" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3619" xlink:to="Locator_us-gaap_DepreciationAndAmortization_3620" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3623" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3624" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3623" xlink:to="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_3624" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3625" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue" xlink:label="Locator_cmcsa_CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue_3626" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3625" xlink:to="Locator_cmcsa_CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue_3626" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3627" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_BusinessAcquisitionPurchasePriceAllocationUnfavorableContractAccrual1" xlink:label="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationUnfavorableContractAccrual1_3628" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3627" xlink:to="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationUnfavorableContractAccrual1_3628" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3629" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillOtherChanges" xlink:label="Locator_us-gaap_GoodwillOtherChanges_3630" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3629" xlink:to="Locator_us-gaap_GoodwillOtherChanges_3630" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3615" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_3616" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3615" xlink:to="Locator_us-gaap_Revenues_3616" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3621" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="Locator_us-gaap_OperatingIncomeLoss_3622" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3621" xlink:to="Locator_us-gaap_OperatingIncomeLoss_3622" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3549" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3549" xlink:to="Locator_us-gaap_StatementTable_3550" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingBalanceSheetDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3773" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3774" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3773" xlink:to="Locator_us-gaap_ConsolidationItemsAxis_3774" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3793" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3793" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3794" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3777" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EliminationAndConsolidationAdjustmentsMember" xlink:label="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3778" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3777" xlink:to="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3778" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3775" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3776" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3775" xlink:to="Locator_dei_LegalEntityAxis_3776" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3779" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3780" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3779" xlink:to="Locator_dei_EntityDomain_3780" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3781" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_3782" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3781" xlink:to="Locator_us-gaap_ParentCompanyMember_3782" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3783" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastHoldingsMember" xlink:label="Locator_cmcsa_ComcastHoldingsMember_3784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3783" xlink:to="Locator_cmcsa_ComcastHoldingsMember_3784" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3785" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CcclParentMember" xlink:label="Locator_cmcsa_CcclParentMember_3786" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3785" xlink:to="Locator_cmcsa_CcclParentMember_3786" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3787" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CombinedCchmoParentsMember" xlink:label="Locator_cmcsa_CombinedCchmoParentsMember_3788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3787" xlink:to="Locator_cmcsa_CombinedCchmoParentsMember_3788" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3789" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMediaParentMember" xlink:label="Locator_cmcsa_NbcuniversalMediaParentMember_3790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3789" xlink:to="Locator_cmcsa_NbcuniversalMediaParentMember_3790" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3791" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastNonGuarantorSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3791" xlink:to="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3792" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3795" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="Locator_us-gaap_AssetsAbstract_3796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3795" xlink:to="Locator_us-gaap_AssetsAbstract_3796" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3799" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="Locator_us-gaap_ShortTermInvestments_3800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3799" xlink:to="Locator_us-gaap_ShortTermInvestments_3800" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3803" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingRightsCurrent" xlink:label="Locator_cmcsa_ProgrammingRightsCurrent_3804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3803" xlink:to="Locator_cmcsa_ProgrammingRightsCurrent_3804" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3805" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="Locator_us-gaap_OtherAssetsCurrent_3806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3805" xlink:to="Locator_us-gaap_OtherAssetsCurrent_3806" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3807" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="Locator_us-gaap_AssetsCurrent_3808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3807" xlink:to="Locator_us-gaap_AssetsCurrent_3808" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3809" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCosts" xlink:label="Locator_cmcsa_FilmAndTelevisionCosts_3810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3809" xlink:to="Locator_cmcsa_FilmAndTelevisionCosts_3810" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3811" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermInvestments" xlink:label="Locator_us-gaap_LongTermInvestments_3812" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3811" xlink:to="Locator_us-gaap_LongTermInvestments_3812" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3813" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation" xlink:label="Locator_cmcsa_InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation_3814" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3813" xlink:to="Locator_cmcsa_InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation_3814" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3815" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentNet_3816" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3815" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentNet_3816" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3817" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IndefiniteLivedFranchiseRights" xlink:label="Locator_us-gaap_IndefiniteLivedFranchiseRights_3818" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3817" xlink:to="Locator_us-gaap_IndefiniteLivedFranchiseRights_3818" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3819" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Goodwill" xlink:label="Locator_us-gaap_Goodwill_3820" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3819" xlink:to="Locator_us-gaap_Goodwill_3820" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3821" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherIntangibleAssetsNet" xlink:label="Locator_us-gaap_OtherIntangibleAssetsNet_3822" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3821" xlink:to="Locator_us-gaap_OtherIntangibleAssetsNet_3822" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3823" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="Locator_us-gaap_OtherAssetsNoncurrent_3824" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3823" xlink:to="Locator_us-gaap_OtherAssetsNoncurrent_3824" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3825" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Assets" xlink:label="Locator_us-gaap_Assets_3826" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3825" xlink:to="Locator_us-gaap_Assets_3826" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3827" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3828" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3827" xlink:to="Locator_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3828" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3831" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AccruedParticipationsAndResidualsCurrent" xlink:label="Locator_cmcsa_AccruedParticipationsAndResidualsCurrent_3832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3831" xlink:to="Locator_cmcsa_AccruedParticipationsAndResidualsCurrent_3832" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3833" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue" xlink:label="Locator_cmcsa_AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue_3834" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3833" xlink:to="Locator_cmcsa_AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue_3834" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3835" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtCurrent" xlink:label="Locator_us-gaap_DebtCurrent_3836" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3835" xlink:to="Locator_us-gaap_DebtCurrent_3836" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3837" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="Locator_us-gaap_LiabilitiesCurrent_3838" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3837" xlink:to="Locator_us-gaap_LiabilitiesCurrent_3838" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3839" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations" xlink:label="Locator_us-gaap_LongTermDebtAndCapitalLeaseObligations_3840" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3839" xlink:to="Locator_us-gaap_LongTermDebtAndCapitalLeaseObligations_3840" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3841" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_DeferredTaxLiabilitiesNoncurrent_3842" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3841" xlink:to="Locator_us-gaap_DeferredTaxLiabilitiesNoncurrent_3842" order="24.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3845" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_3846" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3845" xlink:to="Locator_cmcsa_RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_3846" order="26.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3847" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount" xlink:label="Locator_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_3848" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3847" xlink:to="Locator_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_3848" order="27.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3849" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3850" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3849" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_3850" order="28.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3851" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockValue" xlink:label="Locator_us-gaap_CommonStockValue_3852" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3851" xlink:to="Locator_us-gaap_CommonStockValue_3852" order="29.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3853" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherStockholdersEquity" xlink:label="Locator_cmcsa_OtherStockholdersEquity_3854" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3853" xlink:to="Locator_cmcsa_OtherStockholdersEquity_3854" order="30.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3855" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="Locator_us-gaap_StockholdersEquity_3856" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3855" xlink:to="Locator_us-gaap_StockholdersEquity_3856" order="31.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3857" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinorityInterest" xlink:label="Locator_us-gaap_MinorityInterest_3858" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3857" xlink:to="Locator_us-gaap_MinorityInterest_3858" order="32.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3859" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_3860" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3859" xlink:to="Locator_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_3860" order="33.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3861" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="Locator_us-gaap_LiabilitiesAndStockholdersEquity_3862" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3861" xlink:to="Locator_us-gaap_LiabilitiesAndStockholdersEquity_3862" order="34.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3797" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_3798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3797" xlink:to="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_3798" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3801" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetCurrent_3802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3801" xlink:to="Locator_us-gaap_AccountsReceivableNetCurrent_3802" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3829" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="Locator_us-gaap_AccountsPayableCurrent_3830" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3829" xlink:to="Locator_us-gaap_AccountsPayableCurrent_3830" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3843" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_OtherLiabilitiesNoncurrent_3844" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3843" xlink:to="Locator_us-gaap_OtherLiabilitiesNoncurrent_3844" order="25.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3769" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3770" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3769" xlink:to="Locator_us-gaap_StatementTable_3770" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfIncomeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3941" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3942" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3941" xlink:to="Locator_us-gaap_ConsolidationItemsAxis_3942" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_3957" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3958" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_3957" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_3958" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_3959" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EliminationAndConsolidationAdjustmentsMember" xlink:label="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3960" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_3959" xlink:to="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_3960" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3939" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3940" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_3939" xlink:to="Locator_dei_LegalEntityAxis_3940" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_3943" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3944" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_3943" xlink:to="Locator_dei_EntityDomain_3944" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3945" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_3946" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3945" xlink:to="Locator_us-gaap_ParentCompanyMember_3946" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3947" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastHoldingsMember" xlink:label="Locator_cmcsa_ComcastHoldingsMember_3948" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3947" xlink:to="Locator_cmcsa_ComcastHoldingsMember_3948" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3949" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CcclParentMember" xlink:label="Locator_cmcsa_CcclParentMember_3950" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3949" xlink:to="Locator_cmcsa_CcclParentMember_3950" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3951" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CombinedCchmoParentsMember" xlink:label="Locator_cmcsa_CombinedCchmoParentsMember_3952" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3951" xlink:to="Locator_cmcsa_CombinedCchmoParentsMember_3952" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3953" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMediaParentMember" xlink:label="Locator_cmcsa_NbcuniversalMediaParentMember_3954" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3953" xlink:to="Locator_cmcsa_NbcuniversalMediaParentMember_3954" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_3955" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastNonGuarantorSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3956" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_3955" xlink:to="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_3956" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3961" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="Locator_us-gaap_SalesRevenueServicesNet_3962" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3961" xlink:to="Locator_us-gaap_SalesRevenueServicesNet_3962" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3963" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ManagementFeesRevenue" xlink:label="Locator_us-gaap_ManagementFeesRevenue_3964" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3963" xlink:to="Locator_us-gaap_ManagementFeesRevenue_3964" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3969" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndProductionCosts" xlink:label="Locator_cmcsa_ProgrammingAndProductionCosts_3970" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3969" xlink:to="Locator_cmcsa_ProgrammingAndProductionCosts_3970" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3971" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherOperatingAndAdministrative" xlink:label="Locator_cmcsa_OtherOperatingAndAdministrative_3972" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3971" xlink:to="Locator_cmcsa_OtherOperatingAndAdministrative_3972" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3973" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="Locator_us-gaap_MarketingAndAdvertisingExpense_3974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3973" xlink:to="Locator_us-gaap_MarketingAndAdvertisingExpense_3974" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3975" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Depreciation" xlink:label="Locator_us-gaap_Depreciation_3976" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3975" xlink:to="Locator_us-gaap_Depreciation_3976" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3977" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="Locator_us-gaap_AmortizationOfIntangibleAssets_3978" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3977" xlink:to="Locator_us-gaap_AmortizationOfIntangibleAssets_3978" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3979" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="Locator_us-gaap_CostsAndExpenses_3980" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3979" xlink:to="Locator_us-gaap_CostsAndExpenses_3980" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3985" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InterestExpense" xlink:label="Locator_us-gaap_InterestExpense_3986" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3985" xlink:to="Locator_us-gaap_InterestExpense_3986" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3989" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_3990" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3989" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_3990" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3991" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="Locator_us-gaap_OtherNonoperatingIncomeExpense_3992" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3991" xlink:to="Locator_us-gaap_OtherNonoperatingIncomeExpense_3992" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3993" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="Locator_us-gaap_NonoperatingIncomeExpense_3994" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3993" xlink:to="Locator_us-gaap_NonoperatingIncomeExpense_3994" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4001" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_4002" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4001" xlink:to="Locator_cmcsa_NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock_4002" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4007" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="Locator_us-gaap_ComprehensiveIncomeNetOfTax_4008" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4007" xlink:to="Locator_us-gaap_ComprehensiveIncomeNetOfTax_4008" order="24.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3987" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="Locator_us-gaap_InvestmentIncomeNonoperating_3988" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3987" xlink:to="Locator_us-gaap_InvestmentIncomeNonoperating_3988" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3965" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_3966" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3965" xlink:to="Locator_us-gaap_Revenues_3966" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3967" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_3968" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3967" xlink:to="Locator_us-gaap_CostsAndExpensesAbstract_3968" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3981" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="Locator_us-gaap_OperatingIncomeLoss_3982" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3981" xlink:to="Locator_us-gaap_OperatingIncomeLoss_3982" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3983" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_3984" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3983" xlink:to="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_3984" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3995" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_3996" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3995" xlink:to="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_3996" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3997" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_IncomeTaxExpenseBenefit_3998" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3997" xlink:to="Locator_us-gaap_IncomeTaxExpenseBenefit_3998" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3999" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_4000" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_3999" xlink:to="Locator_us-gaap_ProfitLoss_4000" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4003" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4004" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4003" xlink:to="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_4004" order="22.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4005" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="Locator_us-gaap_NetIncomeLoss_4006" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4005" xlink:to="Locator_us-gaap_NetIncomeLoss_4006" order="23.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_3935" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_3936" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_3935" xlink:to="Locator_us-gaap_StatementTable_3936" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationCondensedConsolidatingStatementOfCashFlowsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4097" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_4098" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4097" xlink:to="Locator_us-gaap_ConsolidationItemsAxis_4098" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="Locator_us-gaap_ConsolidationItemsAxis_4101" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_4102" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ConsolidationItemsAxis_4101" xlink:to="Locator_us-gaap_ConsolidationItemsDomain_4102" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="Locator_us-gaap_ConsolidationItemsDomain_4103" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EliminationAndConsolidationAdjustmentsMember" xlink:label="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_4104" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ConsolidationItemsDomain_4103" xlink:to="Locator_cmcsa_EliminationAndConsolidationAdjustmentsMember_4104" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4095" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4096" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4095" xlink:to="Locator_dei_LegalEntityAxis_4096" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4099" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4100" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4099" xlink:to="Locator_dei_EntityDomain_4100" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4105" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ParentCompanyMember" xlink:label="Locator_us-gaap_ParentCompanyMember_4106" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4105" xlink:to="Locator_us-gaap_ParentCompanyMember_4106" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4107" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastHoldingsMember" xlink:label="Locator_cmcsa_ComcastHoldingsMember_4108" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4107" xlink:to="Locator_cmcsa_ComcastHoldingsMember_4108" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4109" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CcclParentMember" xlink:label="Locator_cmcsa_CcclParentMember_4110" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4109" xlink:to="Locator_cmcsa_CcclParentMember_4110" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4111" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CombinedCchmoParentsMember" xlink:label="Locator_cmcsa_CombinedCchmoParentsMember_4112" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4111" xlink:to="Locator_cmcsa_CombinedCchmoParentsMember_4112" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4113" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMediaParentMember" xlink:label="Locator_cmcsa_NbcuniversalMediaParentMember_4114" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4113" xlink:to="Locator_cmcsa_NbcuniversalMediaParentMember_4114" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4115" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastNonGuarantorSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_4116" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4115" xlink:to="Locator_cmcsa_ComcastNonGuarantorSubsidiariesMember_4116" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4117" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4118" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4117" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4118" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4119" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_4120" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_4119" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_4120" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4121" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4122" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4121" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4122" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4123" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NetTransactionsWithAffiliates" xlink:label="Locator_cmcsa_NetTransactionsWithAffiliates_4124" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4123" xlink:to="Locator_cmcsa_NetTransactionsWithAffiliates_4124" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4125" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_4126" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4125" xlink:to="Locator_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_4126" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4127" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="Locator_us-gaap_PaymentsToAcquireIntangibleAssets_4128" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4127" xlink:to="Locator_us-gaap_PaymentsToAcquireIntangibleAssets_4128" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4129" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties" xlink:label="Locator_cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties_4130" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4129" xlink:to="Locator_cmcsa_PaymentsForAcquisitionsAndConstructionOfRealEstateProperties_4130" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4131" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="Locator_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4132" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4131" xlink:to="Locator_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_4132" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4133" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProceedsFromSalesOfBusinessesAndInvestments" xlink:label="Locator_cmcsa_ProceedsFromSalesOfBusinessesAndInvestments_4134" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4133" xlink:to="Locator_cmcsa_ProceedsFromSalesOfBusinessesAndInvestments_4134" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4135" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital" xlink:label="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_4136" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4135" xlink:to="Locator_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_4136" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4137" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireInvestments" xlink:label="Locator_us-gaap_PaymentsToAcquireInvestments_4138" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4137" xlink:to="Locator_us-gaap_PaymentsToAcquireInvestments_4138" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4139" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="Locator_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_4140" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4139" xlink:to="Locator_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_4140" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4141" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivities_4142" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_4141" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInInvestingActivities_4142" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4143" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4144" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4143" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4144" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4145" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt" xlink:label="Locator_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_4146" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4145" xlink:to="Locator_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_4146" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4147" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromOtherDebt" xlink:label="Locator_us-gaap_ProceedsFromOtherDebt_4148" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4147" xlink:to="Locator_us-gaap_ProceedsFromOtherDebt_4148" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4149" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RepaymentsOfOtherDebt" xlink:label="Locator_us-gaap_RepaymentsOfOtherDebt_4150" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4149" xlink:to="Locator_us-gaap_RepaymentsOfOtherDebt_4150" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4151" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="Locator_us-gaap_PaymentsForRepurchaseOfCommonStock_4152" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4151" xlink:to="Locator_us-gaap_PaymentsForRepurchaseOfCommonStock_4152" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4153" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="Locator_us-gaap_PaymentsOfDividends_4154" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4153" xlink:to="Locator_us-gaap_PaymentsOfDividends_4154" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4155" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="Locator_us-gaap_ProceedsFromIssuanceOfCommonStock_4156" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4155" xlink:to="Locator_us-gaap_ProceedsFromIssuanceOfCommonStock_4156" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4157" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries" xlink:label="Locator_us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries_4158" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4157" xlink:to="Locator_us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries_4158" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4159" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock" xlink:label="Locator_cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock_4160" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4159" xlink:to="Locator_cmcsa_DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock_4160" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4161" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="Locator_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_4162" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4161" xlink:to="Locator_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_4162" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4163" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SettlementOfStationVentureLiability" xlink:label="Locator_cmcsa_SettlementOfStationVentureLiability_4164" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4163" xlink:to="Locator_cmcsa_SettlementOfStationVentureLiability_4164" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4165" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities" xlink:label="Locator_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4166" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4165" xlink:to="Locator_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4166" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4167" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivities_4168" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_4167" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInFinancingActivities_4168" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4169" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="Locator_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_4170" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4169" xlink:to="Locator_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_4170" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4171" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_4172" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4171" xlink:to="Locator_us-gaap_CashAndCashEquivalentsAtCarryingValue_4172" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4045" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4046" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4045" xlink:to="Locator_us-gaap_StatementTable_4046" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DocumentDocumentAndEntityInformation">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4231" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_4232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4231" xlink:to="Locator_us-gaap_StatementClassOfStockAxis_4232" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_4235" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_4236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_4235" xlink:to="Locator_us-gaap_ClassOfStockDomain_4236" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="Locator_us-gaap_StatementClassOfStockAxis_4279" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_4280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_StatementClassOfStockAxis_4279" xlink:to="Locator_us-gaap_ClassOfStockDomain_4280" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_4237" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassAMember" xlink:label="Locator_us-gaap_CommonClassAMember_4238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_4237" xlink:to="Locator_us-gaap_CommonClassAMember_4238" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_4239" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ClassaSpecialCommonStockMember" xlink:label="Locator_cmcsa_ClassaSpecialCommonStockMember_4240" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_4239" xlink:to="Locator_cmcsa_ClassaSpecialCommonStockMember_4240" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="Locator_us-gaap_ClassOfStockDomain_4241" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonClassBMember" xlink:label="Locator_us-gaap_CommonClassBMember_4242" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ClassOfStockDomain_4241" xlink:to="Locator_us-gaap_CommonClassBMember_4242" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4233" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4233" xlink:to="Locator_dei_LegalEntityAxis_4234" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4243" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4244" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4243" xlink:to="Locator_dei_EntityDomain_4244" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4277" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_dei_LegalEntityAxis_4277" xlink:to="Locator_dei_EntityDomain_4278" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4245" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4246" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4245" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4246" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4247" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentType" xlink:label="Locator_dei_DocumentType_4248" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4247" xlink:to="Locator_dei_DocumentType_4248" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4249" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_AmendmentFlag" xlink:label="Locator_dei_AmendmentFlag_4250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4249" xlink:to="Locator_dei_AmendmentFlag_4250" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4251" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="Locator_dei_DocumentPeriodEndDate_4252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4251" xlink:to="Locator_dei_DocumentPeriodEndDate_4252" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4253" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="Locator_dei_DocumentFiscalYearFocus_4254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4253" xlink:to="Locator_dei_DocumentFiscalYearFocus_4254" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4255" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="Locator_dei_DocumentFiscalPeriodFocus_4256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4255" xlink:to="Locator_dei_DocumentFiscalPeriodFocus_4256" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4257" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_TradingSymbol" xlink:label="Locator_dei_TradingSymbol_4258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4257" xlink:to="Locator_dei_TradingSymbol_4258" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4259" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityRegistrantName" xlink:label="Locator_dei_EntityRegistrantName_4260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4259" xlink:to="Locator_dei_EntityRegistrantName_4260" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="Locator_dei_EntityCentralIndexKey_4262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4261" xlink:to="Locator_dei_EntityCentralIndexKey_4262" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4263" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="Locator_dei_CurrentFiscalYearEndDate_4264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4263" xlink:to="Locator_dei_CurrentFiscalYearEndDate_4264" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4265" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityFilerCategory" xlink:label="Locator_dei_EntityFilerCategory_4266" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4265" xlink:to="Locator_dei_EntityFilerCategory_4266" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4267" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="Locator_dei_EntityCommonStockSharesOutstanding_4268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4267" xlink:to="Locator_dei_EntityCommonStockSharesOutstanding_4268" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4269" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityPublicFloat" xlink:label="Locator_dei_EntityPublicFloat_4270" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4269" xlink:to="Locator_dei_EntityPublicFloat_4270" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4271" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="Locator_dei_EntityCurrentReportingStatus_4272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4271" xlink:to="Locator_dei_EntityCurrentReportingStatus_4272" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4273" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="Locator_dei_EntityWellKnownSeasonedIssuer_4274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4273" xlink:to="Locator_dei_EntityWellKnownSeasonedIssuer_4274" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4275" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="Locator_dei_EntityVoluntaryFilers_4276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4275" xlink:to="Locator_dei_EntityVoluntaryFilers_4276" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4227" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4228" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4227" xlink:to="Locator_us-gaap_StatementTable_4228" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedFinancialStatements">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4305" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4305" xlink:to="Locator_dei_LegalEntityAxis_4306" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4307" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4308" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4307" xlink:to="Locator_dei_EntityDomain_4308" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4309" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4310" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4309" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4310" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4311" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock" xlink:label="Locator_us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_4312" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4311" xlink:to="Locator_us-gaap_BusinessDescriptionAndBasisOfPresentationTextBlock_4312" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4301" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4301" xlink:to="Locator_us-gaap_StatementTable_4302" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureAccountingPolicies">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4323" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4324" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4323" xlink:to="Locator_dei_LegalEntityAxis_4324" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4325" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4326" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4325" xlink:to="Locator_dei_EntityDomain_4326" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4327" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4328" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4327" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4328" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4329" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="Locator_us-gaap_SignificantAccountingPoliciesTextBlock_4330" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4329" xlink:to="Locator_us-gaap_SignificantAccountingPoliciesTextBlock_4330" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4331" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4332" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4331" xlink:to="Locator_us-gaap_StatementTable_4332" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePropertyAndEquipment">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4345" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4346" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4345" xlink:to="Locator_dei_LegalEntityAxis_4346" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4347" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4348" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4347" xlink:to="Locator_dei_EntityDomain_4348" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4349" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4350" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4349" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4350" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4351" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_4352" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4351" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock_4352" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4353" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4354" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4353" xlink:to="Locator_us-gaap_StatementTable_4354" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefits">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4367" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4368" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4367" xlink:to="Locator_dei_LegalEntityAxis_4368" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4369" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4370" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4369" xlink:to="Locator_dei_EntityDomain_4370" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4371" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4372" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4371" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4372" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4373" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock" xlink:label="Locator_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_4374" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4373" xlink:to="Locator_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_4374" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4375" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4376" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4375" xlink:to="Locator_us-gaap_StatementTable_4376" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensation">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4393" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4393" xlink:to="Locator_dei_LegalEntityAxis_4394" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4395" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4395" xlink:to="Locator_dei_EntityDomain_4396" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4397" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4398" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4397" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4398" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4399" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="Locator_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_4400" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4399" xlink:to="Locator_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_4400" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4389" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4390" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4389" xlink:to="Locator_us-gaap_StatementTable_4390" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxes">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4411" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4412" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4411" xlink:to="Locator_dei_LegalEntityAxis_4412" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4413" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4413" xlink:to="Locator_dei_EntityDomain_4414" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4415" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4416" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4415" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4416" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4417" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="Locator_us-gaap_IncomeTaxDisclosureTextBlock_4418" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4417" xlink:to="Locator_us-gaap_IncomeTaxDisclosureTextBlock_4418" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4419" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4420" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4419" xlink:to="Locator_us-gaap_StatementTable_4420" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureQuarterlyFinancialInformation">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4433" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4434" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4433" xlink:to="Locator_dei_LegalEntityAxis_4434" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4435" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4436" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4435" xlink:to="Locator_dei_EntityDomain_4436" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4437" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4438" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4437" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4438" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4439" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_QuarterlyFinancialInformationTextBlock" xlink:label="Locator_us-gaap_QuarterlyFinancialInformationTextBlock_4440" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4439" xlink:to="Locator_us-gaap_QuarterlyFinancialInformationTextBlock_4440" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4441" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4442" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4441" xlink:to="Locator_us-gaap_StatementTable_4442" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureAccountingPoliciesPolicy">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4491" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4492" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4491" xlink:to="Locator_dei_LegalEntityAxis_4492" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4493" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4494" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4493" xlink:to="Locator_dei_EntityDomain_4494" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4495" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4496" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4495" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4496" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4497" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock" xlink:label="Locator_us-gaap_ConsolidationPolicyTextBlock_4498" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4497" xlink:to="Locator_us-gaap_ConsolidationPolicyTextBlock_4498" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4499" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock" xlink:label="Locator_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_4500" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4499" xlink:to="Locator_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_4500" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4501" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CashAndCashEquivalentsPolicyTextBlock" xlink:label="Locator_us-gaap_CashAndCashEquivalentsPolicyTextBlock_4502" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4501" xlink:to="Locator_us-gaap_CashAndCashEquivalentsPolicyTextBlock_4502" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4503" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="Locator_us-gaap_UseOfEstimates_4504" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4503" xlink:to="Locator_us-gaap_UseOfEstimates_4504" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4505" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsPolicyTextBlock" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsPolicyTextBlock_4506" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4505" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsPolicyTextBlock_4506" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4507" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentPolicyTextBlock" xlink:label="Locator_us-gaap_InvestmentPolicyTextBlock_4508" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4507" xlink:to="Locator_us-gaap_InvestmentPolicyTextBlock_4508" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_4510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4509" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_4510" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4511" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock" xlink:label="Locator_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_4512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4511" xlink:to="Locator_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_4512" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4513" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock" xlink:label="Locator_us-gaap_AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock_4514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4513" xlink:to="Locator_us-gaap_AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock_4514" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4515" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="Locator_us-gaap_RevenueRecognitionPolicyTextBlock_4516" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4515" xlink:to="Locator_us-gaap_RevenueRecognitionPolicyTextBlock_4516" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4517" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableCommunicationsProgrammingExpensesPolicyTextBlock" xlink:label="Locator_cmcsa_CableCommunicationsProgrammingExpensesPolicyTextBlock_4518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4517" xlink:to="Locator_cmcsa_CableCommunicationsProgrammingExpensesPolicyTextBlock_4518" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4519" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost" xlink:label="Locator_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_4520" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4519" xlink:to="Locator_us-gaap_AdvertisingCostPolicyExpensedAdvertisingCost_4520" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4521" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CompensationRelatedCostsPolicyTextBlock" xlink:label="Locator_us-gaap_CompensationRelatedCostsPolicyTextBlock_4522" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4521" xlink:to="Locator_us-gaap_CompensationRelatedCostsPolicyTextBlock_4522" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4523" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionAndOtherPostretirementPlansPolicy" xlink:label="Locator_us-gaap_PensionAndOtherPostretirementPlansPolicy_4524" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4523" xlink:to="Locator_us-gaap_PensionAndOtherPostretirementPlansPolicy_4524" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4525" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock" xlink:label="Locator_us-gaap_IncomeTaxPolicyTextBlock_4526" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4525" xlink:to="Locator_us-gaap_IncomeTaxPolicyTextBlock_4526" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4527" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock" xlink:label="Locator_us-gaap_EarningsPerSharePolicyTextBlock_4528" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4527" xlink:to="Locator_us-gaap_EarningsPerSharePolicyTextBlock_4528" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4529" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueOfFinancialInstrumentsPolicy" xlink:label="Locator_us-gaap_FairValueOfFinancialInstrumentsPolicy_4530" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4529" xlink:to="Locator_us-gaap_FairValueOfFinancialInstrumentsPolicy_4530" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4487" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4488" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4487" xlink:to="Locator_us-gaap_StatementTable_4488" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSignificantTransactionsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4549" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4549" xlink:to="Locator_dei_LegalEntityAxis_4550" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4551" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4551" xlink:to="Locator_dei_EntityDomain_4552" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4553" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4553" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4554" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4555" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfPurchasePriceAllocationTableTextBlock1" xlink:label="Locator_cmcsa_ScheduleOfPurchasePriceAllocationTableTextBlock1_4556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4555" xlink:to="Locator_cmcsa_ScheduleOfPurchasePriceAllocationTableTextBlock1_4556" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4557" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ContingentConsiderationTableTextBlock" xlink:label="Locator_cmcsa_ContingentConsiderationTableTextBlock_4558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4557" xlink:to="Locator_cmcsa_ContingentConsiderationTableTextBlock_4558" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4559" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfAcquisitionRelatedExpensesIncludedInConsolidatedStatementOfIncomeTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfAcquisitionRelatedExpensesIncludedInConsolidatedStatementOfIncomeTableTextBlock_4560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4559" xlink:to="Locator_cmcsa_ScheduleOfAcquisitionRelatedExpensesIncludedInConsolidatedStatementOfIncomeTableTextBlock_4560" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4561" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock" xlink:label="Locator_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_4562" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4561" xlink:to="Locator_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_4562" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4563" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4564" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4563" xlink:to="Locator_us-gaap_StatementTable_4564" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4583" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4584" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4583" xlink:to="Locator_dei_LegalEntityAxis_4584" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4585" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4586" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4585" xlink:to="Locator_dei_EntityDomain_4586" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4587" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4588" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4587" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4588" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4589" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SummaryInvestmentHoldingsTextBlock" xlink:label="Locator_us-gaap_SummaryInvestmentHoldingsTextBlock_4590" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4589" xlink:to="Locator_us-gaap_SummaryInvestmentHoldingsTextBlock_4590" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4591" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComponentsOfInvestmentIncomeLossNetTableTextBlock" xlink:label="Locator_cmcsa_ComponentsOfInvestmentIncomeLossNetTableTextBlock_4592" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4591" xlink:to="Locator_cmcsa_ComponentsOfInvestmentIncomeLossNetTableTextBlock_4592" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4593" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_4594" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4593" xlink:to="Locator_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_4594" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4595" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PrepaidForwardSaleAgreementsTableTextBlock" xlink:label="Locator_cmcsa_PrepaidForwardSaleAgreementsTableTextBlock_4596" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4595" xlink:to="Locator_cmcsa_PrepaidForwardSaleAgreementsTableTextBlock_4596" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4597" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4598" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4597" xlink:to="Locator_us-gaap_StatementTable_4598" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePropertyAndEquipmentTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4611" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4612" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4611" xlink:to="Locator_dei_LegalEntityAxis_4612" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4613" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4614" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4613" xlink:to="Locator_dei_EntityDomain_4614" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4615" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4616" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4615" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4616" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4617" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock" xlink:label="Locator_us-gaap_PropertyPlantAndEquipmentTextBlock_4618" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4617" xlink:to="Locator_us-gaap_PropertyPlantAndEquipmentTextBlock_4618" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4619" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4620" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4619" xlink:to="Locator_us-gaap_StatementTable_4620" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureGoodwillTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4637" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4637" xlink:to="Locator_dei_LegalEntityAxis_4638" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4639" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4639" xlink:to="Locator_dei_EntityDomain_4640" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4641" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4641" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4642" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4643" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfGoodwillTextBlock" xlink:label="Locator_us-gaap_ScheduleOfGoodwillTextBlock_4644" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4643" xlink:to="Locator_us-gaap_ScheduleOfGoodwillTextBlock_4644" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4645" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IntangibleAssetsDisclosureTextBlock" xlink:label="Locator_us-gaap_IntangibleAssetsDisclosureTextBlock_4646" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4645" xlink:to="Locator_us-gaap_IntangibleAssetsDisclosureTextBlock_4646" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4647" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock" xlink:label="Locator_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_4648" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4647" xlink:to="Locator_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_4648" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4649" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4650" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4649" xlink:to="Locator_us-gaap_StatementTable_4650" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureLongTermDebtTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4671" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4672" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4671" xlink:to="Locator_dei_LegalEntityAxis_4672" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4673" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4674" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4673" xlink:to="Locator_dei_EntityDomain_4674" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4675" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4676" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4675" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4676" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4677" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfDebtTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfDebtTableTextBlock_4678" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4677" xlink:to="Locator_us-gaap_ScheduleOfDebtTableTextBlock_4678" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4679" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_4680" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4679" xlink:to="Locator_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_4680" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4681" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DebtBorrowingsTableTextBlock" xlink:label="Locator_cmcsa_DebtBorrowingsTableTextBlock_4682" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4681" xlink:to="Locator_cmcsa_DebtBorrowingsTableTextBlock_4682" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4683" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DebtRepaymentsAndRepurchasesTableTextBlock" xlink:label="Locator_cmcsa_DebtRepaymentsAndRepurchasesTableTextBlock_4684" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4683" xlink:to="Locator_cmcsa_DebtRepaymentsAndRepurchasesTableTextBlock_4684" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4685" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ChangeInCarryingValueOfDebtComponentAndChangeInFairValueOfDerivativeComponentTableTextBlock" xlink:label="Locator_cmcsa_ChangeInCarryingValueOfDebtComponentAndChangeInFairValueOfDerivativeComponentTableTextBlock_4686" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4685" xlink:to="Locator_cmcsa_ChangeInCarryingValueOfDebtComponentAndChangeInFairValueOfDerivativeComponentTableTextBlock_4686" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4687" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4688" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4687" xlink:to="Locator_us-gaap_StatementTable_4688" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFairValueMeasurementsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4703" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4704" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4703" xlink:to="Locator_dei_LegalEntityAxis_4704" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4705" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4706" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4705" xlink:to="Locator_dei_EntityDomain_4706" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4707" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4708" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4707" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4708" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4709" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_4710" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4709" xlink:to="Locator_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_4710" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4711" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="Locator_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_4712" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4711" xlink:to="Locator_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_4712" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4713" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4714" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4713" xlink:to="Locator_us-gaap_StatementTable_4714" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureNoncontrollingInterestsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4727" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4728" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4727" xlink:to="Locator_dei_LegalEntityAxis_4728" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4729" xlink:to="Locator_dei_EntityDomain_4730" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4731" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4732" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4731" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4732" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4733" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTextBlock" xlink:label="Locator_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTextBlock_4734" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4733" xlink:to="Locator_us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfChangesNetTextBlock_4734" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4735" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4736" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4735" xlink:to="Locator_us-gaap_StatementTable_4736" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePostretirementPensionAndOtherEmployeeBenefitPlansTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4759" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4760" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4759" xlink:to="Locator_dei_LegalEntityAxis_4760" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4761" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4762" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4761" xlink:to="Locator_dei_EntityDomain_4762" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4763" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4764" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4763" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4764" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4765" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock" xlink:label="Locator_cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock_4766" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4765" xlink:to="Locator_cmcsa_CondensedInformationOnOurPostretirementAndPensionBenefitPlansTextBlock_4766" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4767" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DeferredCompensationPlansTextBlock" xlink:label="Locator_cmcsa_DeferredCompensationPlansTextBlock_4768" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4767" xlink:to="Locator_cmcsa_DeferredCompensationPlansTextBlock_4768" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4769" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock" xlink:label="Locator_cmcsa_ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock_4770" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4769" xlink:to="Locator_cmcsa_ScheduleOfBenefitObligationAndExpenseForOurSplitDollarLifeInsuranceAgreementsTextBlock_4770" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4771" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_4772" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4771" xlink:to="Locator_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_4772" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4773" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_4774" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4773" xlink:to="Locator_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_4774" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4775" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CondensedInformationOnOurPensionBenefitPlansTextBlock" xlink:label="Locator_cmcsa_CondensedInformationOnOurPensionBenefitPlansTextBlock_4776" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4775" xlink:to="Locator_cmcsa_CondensedInformationOnOurPensionBenefitPlansTextBlock_4776" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4777" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4778" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4777" xlink:to="Locator_us-gaap_StatementTable_4778" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureEquityTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4795" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4795" xlink:to="Locator_dei_LegalEntityAxis_4796" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4797" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4797" xlink:to="Locator_dei_EntityDomain_4798" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4799" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4799" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4800" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4801" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ChangesInCommonStockTextBlock" xlink:label="Locator_cmcsa_ChangesInCommonStockTextBlock_4802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4801" xlink:to="Locator_cmcsa_ChangesInCommonStockTextBlock_4802" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4803" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AggregateShareRepurchasesTextBlock" xlink:label="Locator_cmcsa_AggregateShareRepurchasesTextBlock_4804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4803" xlink:to="Locator_cmcsa_AggregateShareRepurchasesTextBlock_4804" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4805" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfDividendsTextBlock" xlink:label="Locator_cmcsa_ScheduleOfDividendsTextBlock_4806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4805" xlink:to="Locator_cmcsa_ScheduleOfDividendsTextBlock_4806" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4807" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4807" xlink:to="Locator_us-gaap_StatementTable_4808" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4833" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4834" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4833" xlink:to="Locator_dei_LegalEntityAxis_4834" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4835" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4836" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4835" xlink:to="Locator_dei_EntityDomain_4836" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4837" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4838" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4837" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4838" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4839" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_4840" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4839" xlink:to="Locator_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_4840" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4841" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_StockOptionActivityTextBlock" xlink:label="Locator_cmcsa_StockOptionActivityTextBlock_4842" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4841" xlink:to="Locator_cmcsa_StockOptionActivityTextBlock_4842" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4843" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_StockOptionFairValueAndSignificantAssumptionsTextBlock" xlink:label="Locator_cmcsa_StockOptionFairValueAndSignificantAssumptionsTextBlock_4844" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4843" xlink:to="Locator_cmcsa_StockOptionFairValueAndSignificantAssumptionsTextBlock_4844" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4845" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ExercisedStockOptionsTextBlock" xlink:label="Locator_cmcsa_ExercisedStockOptionsTextBlock_4846" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4845" xlink:to="Locator_cmcsa_ExercisedStockOptionsTextBlock_4846" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4847" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_WeightedAverageFairValueOfRestrictedStockUnitsTextBlock" xlink:label="Locator_cmcsa_WeightedAverageFairValueOfRestrictedStockUnitsTextBlock_4848" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4847" xlink:to="Locator_cmcsa_WeightedAverageFairValueOfRestrictedStockUnitsTextBlock_4848" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4849" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RestrictedStockPlanActivityTextBlock" xlink:label="Locator_cmcsa_RestrictedStockPlanActivityTextBlock_4850" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4849" xlink:to="Locator_cmcsa_RestrictedStockPlanActivityTextBlock_4850" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4851" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_VestedRestrictedShareUnitsTextBlock" xlink:label="Locator_cmcsa_VestedRestrictedShareUnitsTextBlock_4852" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4851" xlink:to="Locator_cmcsa_VestedRestrictedShareUnitsTextBlock_4852" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4853" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4854" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4853" xlink:to="Locator_us-gaap_StatementTable_4854" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4873" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4874" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4873" xlink:to="Locator_dei_LegalEntityAxis_4874" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4875" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4876" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4875" xlink:to="Locator_dei_EntityDomain_4876" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4877" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4878" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4877" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4878" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4879" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_4880" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4879" xlink:to="Locator_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_4880" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4881" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_4882" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4881" xlink:to="Locator_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_4882" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4883" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_4884" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4883" xlink:to="Locator_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_4884" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4885" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SummaryOfIncomeTaxContingenciesTextBlock" xlink:label="Locator_us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_4886" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4885" xlink:to="Locator_us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_4886" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4887" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4888" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4887" xlink:to="Locator_us-gaap_StatementTable_4888" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4909" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4909" xlink:to="Locator_dei_LegalEntityAxis_4910" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4911" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4911" xlink:to="Locator_dei_EntityDomain_4912" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4913" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4914" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4913" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4914" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4915" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_4916" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4915" xlink:to="Locator_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock_4916" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4917" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_4918" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4917" xlink:to="Locator_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_4918" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4919" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfOtherOperatingCostAndExpenseByComponentTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfOtherOperatingCostAndExpenseByComponentTableTextBlock_4920" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4919" xlink:to="Locator_cmcsa_ScheduleOfOtherOperatingCostAndExpenseByComponentTableTextBlock_4920" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4921" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfAdjustmentsToReconcileNetIncomeToNetCashProvidedByOperatingActivitiesTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfAdjustmentsToReconcileNetIncomeToNetCashProvidedByOperatingActivitiesTableTextBlock_4922" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4921" xlink:to="Locator_cmcsa_ScheduleOfAdjustmentsToReconcileNetIncomeToNetCashProvidedByOperatingActivitiesTableTextBlock_4922" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4923" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_4924" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4923" xlink:to="Locator_us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock_4924" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4925" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4926" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4925" xlink:to="Locator_us-gaap_StatementTable_4926" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCommitmentsAndContingenciesTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4941" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4942" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4941" xlink:to="Locator_dei_LegalEntityAxis_4942" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4943" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4944" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4943" xlink:to="Locator_dei_EntityDomain_4944" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4945" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4946" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4945" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4946" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4947" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommitmentsDisclosureTextBlock" xlink:label="Locator_us-gaap_CommitmentsDisclosureTextBlock_4948" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4947" xlink:to="Locator_us-gaap_CommitmentsDisclosureTextBlock_4948" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4949" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RentalExpenseTableTextBlock" xlink:label="Locator_cmcsa_RentalExpenseTableTextBlock_4950" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4949" xlink:to="Locator_cmcsa_RentalExpenseTableTextBlock_4950" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4951" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4952" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4951" xlink:to="Locator_us-gaap_StatementTable_4952" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFinancialDataByBusinessSegmentTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4973" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_4973" xlink:to="Locator_dei_LegalEntityAxis_4974" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_4975" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4976" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_4975" xlink:to="Locator_dei_EntityDomain_4976" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_4977" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_4978" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_4977" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_4978" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4979" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock" xlink:label="Locator_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_4980" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4979" xlink:to="Locator_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock_4980" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4981" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableSegmentAndCorporateAndOtherReclassificationTextBlock" xlink:label="Locator_cmcsa_CableSegmentAndCorporateAndOtherReclassificationTextBlock_4982" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4981" xlink:to="Locator_cmcsa_CableSegmentAndCorporateAndOtherReclassificationTextBlock_4982" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4983" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock" xlink:label="Locator_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_4984" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_4983" xlink:to="Locator_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTextBlock_4984" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_4969" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_4970" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_4969" xlink:to="Locator_us-gaap_StatementTable_4970" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureBusinessAndBasisOfPresentationDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5007" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_5008" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5007" xlink:to="Locator_us-gaap_StatementBusinessSegmentsAxis_5008" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="Locator_us-gaap_StatementBusinessSegmentsAxis_5011" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_5012" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_StatementBusinessSegmentsAxis_5011" xlink:to="Locator_us-gaap_SegmentDomain_5012" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_5013" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_VideoCustomersMember" xlink:label="Locator_cmcsa_VideoCustomersMember_5014" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_5013" xlink:to="Locator_cmcsa_VideoCustomersMember_5014" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_5015" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_HighSpeedInternetCustomersMember" xlink:label="Locator_cmcsa_HighSpeedInternetCustomersMember_5016" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_5015" xlink:to="Locator_cmcsa_HighSpeedInternetCustomersMember_5016" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SegmentDomain" xlink:label="Locator_us-gaap_SegmentDomain_5017" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PhoneCustomersMember" xlink:label="Locator_cmcsa_PhoneCustomersMember_5018" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_SegmentDomain_5017" xlink:to="Locator_cmcsa_PhoneCustomersMember_5018" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5009" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5010" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5009" xlink:to="Locator_dei_LegalEntityAxis_5010" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5019" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5020" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5019" xlink:to="Locator_dei_EntityDomain_5020" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5021" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5021" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5022" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5023" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NumberOfCustomers" xlink:label="Locator_cmcsa_NumberOfCustomers_5024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5023" xlink:to="Locator_cmcsa_NumberOfCustomers_5024" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5025" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncontrollingInterestAcquired" xlink:label="Locator_cmcsa_NoncontrollingInterestAcquired_5026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5025" xlink:to="Locator_cmcsa_NoncontrollingInterestAcquired_5026" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5027" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Totalcustomerrelationships" xlink:label="Locator_cmcsa_Totalcustomerrelationships_5028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5027" xlink:to="Locator_cmcsa_Totalcustomerrelationships_5028" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5003" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5004" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5003" xlink:to="Locator_us-gaap_StatementTable_5004" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureAccountingPoliciesNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5047" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5048" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5047" xlink:to="Locator_dei_LegalEntityAxis_5048" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5049" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5050" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5049" xlink:to="Locator_dei_EntityDomain_5050" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5051" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5052" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5051" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5052" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5053" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5054" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5053" xlink:to="Locator_us-gaap_StatementTable_5054" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureGoodwillAndOtherIntangibleAssetsAmortizationOfIntangibleAssetsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5075" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5076" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5075" xlink:to="Locator_dei_LegalEntityAxis_5076" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5077" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5078" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5077" xlink:to="Locator_dei_EntityDomain_5078" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5079" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5080" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5079" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5080" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5081" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_5082" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5081" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_5082" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5083" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_5084" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5083" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_5084" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5085" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_5086" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5085" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_5086" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5087" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_5088" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5087" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_5088" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5089" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_5090" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5089" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_5090" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5091" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5092" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5091" xlink:to="Locator_us-gaap_StatementTable_5092" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureShareBasedCompensationNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5151" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5152" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5151" xlink:to="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5152" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5155" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_5156" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5155" xlink:to="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_5156" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5205" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_5206" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_5205" xlink:to="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_5206" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_5157" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="Locator_us-gaap_EmployeeStockOptionMember_5158" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_5157" xlink:to="Locator_us-gaap_EmployeeStockOptionMember_5158" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_5159" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="Locator_us-gaap_RestrictedStockMember_5160" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AntidilutiveSecuritiesNameDomain_5159" xlink:to="Locator_us-gaap_RestrictedStockMember_5160" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5153" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5154" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5153" xlink:to="Locator_dei_LegalEntityAxis_5154" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5161" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5162" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5161" xlink:to="Locator_dei_EntityDomain_5162" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5163" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5164" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5163" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5164" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5165" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_StockOptionsGranted" xlink:label="Locator_cmcsa_StockOptionsGranted_5166" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5165" xlink:to="Locator_cmcsa_StockOptionsGranted_5166" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5167" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RestrictedShareUnitsGranted" xlink:label="Locator_cmcsa_RestrictedShareUnitsGranted_5168" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5167" xlink:to="Locator_cmcsa_RestrictedShareUnitsGranted_5168" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5169" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueOfStockOptionsGranted" xlink:label="Locator_cmcsa_FairValueOfStockOptionsGranted_5170" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5169" xlink:to="Locator_cmcsa_FairValueOfStockOptionsGranted_5170" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5171" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueOfRestrictedShareUnitsGranted" xlink:label="Locator_cmcsa_FairValueOfRestrictedShareUnitsGranted_5172" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5171" xlink:to="Locator_cmcsa_FairValueOfRestrictedShareUnitsGranted_5172" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5173" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="Locator_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5174" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5173" xlink:to="Locator_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_5174" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5175" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="Locator_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_5176" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5175" xlink:to="Locator_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_5176" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5177" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ExcessCashIncomeTaxBenefit" xlink:label="Locator_cmcsa_ExcessCashIncomeTaxBenefit_5178" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5177" xlink:to="Locator_cmcsa_ExcessCashIncomeTaxBenefit_5178" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5179" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDate" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDate_5180" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5179" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationDate_5180" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5181" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_StockOptionLiquidityProgramExpirationDating" xlink:label="Locator_cmcsa_StockOptionLiquidityProgramExpirationDating_5182" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5181" xlink:to="Locator_cmcsa_StockOptionLiquidityProgramExpirationDating_5182" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5183" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriodMaximum" xlink:label="Locator_cmcsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriodMaximum_5184" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5183" xlink:to="Locator_cmcsa_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriodMaximum_5184" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5185" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance" xlink:label="Locator_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_5186" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5185" xlink:to="Locator_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_5186" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5187" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5188" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5187" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5188" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5189" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_5190" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5189" xlink:to="Locator_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_5190" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5191" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_StockOptionLiquidityProgramOutstandingNumber" xlink:label="Locator_cmcsa_StockOptionLiquidityProgramOutstandingNumber_5192" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5191" xlink:to="Locator_cmcsa_StockOptionLiquidityProgramOutstandingNumber_5192" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5193" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NumberOfEntitledCommonStockSharesForEachRestrictedShareUnitAtTimeOfVesting" xlink:label="Locator_cmcsa_NumberOfEntitledCommonStockSharesForEachRestrictedShareUnitAtTimeOfVesting_5194" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5193" xlink:to="Locator_cmcsa_NumberOfEntitledCommonStockSharesForEachRestrictedShareUnitAtTimeOfVesting_5194" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5195" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardDiscountFromMarketPrice" xlink:label="Locator_cmcsa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardDiscountFromMarketPrice_5196" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5195" xlink:to="Locator_cmcsa_ShareBasedCompensationArrangementsByShareBasedPaymentAwardDiscountFromMarketPrice_5196" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5197" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_StockOptionLiquidityProgramOutstandingWeightedAverageExercisePrice" xlink:label="Locator_cmcsa_StockOptionLiquidityProgramOutstandingWeightedAverageExercisePrice_5198" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5197" xlink:to="Locator_cmcsa_StockOptionLiquidityProgramOutstandingWeightedAverageExercisePrice_5198" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5199" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions" xlink:label="Locator_us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions_5200" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5199" xlink:to="Locator_us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions_5200" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5201" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_EmployeePayrollDeductionsForSharePurchasesThroughEmployeeStockPurchasePlan" xlink:label="Locator_cmcsa_EmployeePayrollDeductionsForSharePurchasesThroughEmployeeStockPurchasePlan_5202" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5201" xlink:to="Locator_cmcsa_EmployeePayrollDeductionsForSharePurchasesThroughEmployeeStockPurchasePlan_5202" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5203" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod" xlink:label="Locator_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_5204" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5203" xlink:to="Locator_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_5204" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5147" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5148" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5147" xlink:to="Locator_us-gaap_StatementTable_5148" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureIncomeTaxesNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5249" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_5250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5249" xlink:to="Locator_cmcsa_TaxAdjustmentsAxis_5250" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_5251" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_5252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_TaxAdjustmentsAxis_5251" xlink:to="Locator_cmcsa_TaxAdjustmentsDomain_5252" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsAxis" xlink:label="Locator_cmcsa_TaxAdjustmentsAxis_5253" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_5254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_cmcsa_TaxAdjustmentsAxis_5253" xlink:to="Locator_cmcsa_TaxAdjustmentsDomain_5254" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_5255" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherComprehensiveIncomeMember" xlink:label="Locator_us-gaap_OtherComprehensiveIncomeMember_5256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_5255" xlink:to="Locator_us-gaap_OtherComprehensiveIncomeMember_5256" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_5257" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ShareBasedCompensationMember" xlink:label="Locator_cmcsa_ShareBasedCompensationMember_5258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_5257" xlink:to="Locator_cmcsa_ShareBasedCompensationMember_5258" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_5259" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="Locator_us-gaap_DomesticCountryMember_5260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_5259" xlink:to="Locator_us-gaap_DomesticCountryMember_5260" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TaxAdjustmentsDomain" xlink:label="Locator_cmcsa_TaxAdjustmentsDomain_5261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ForeignCountryMember" xlink:label="Locator_us-gaap_ForeignCountryMember_5262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_TaxAdjustmentsDomain_5261" xlink:to="Locator_us-gaap_ForeignCountryMember_5262" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5263" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5263" xlink:to="Locator_dei_LegalEntityAxis_5264" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5265" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5266" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5265" xlink:to="Locator_dei_EntityDomain_5266" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5267" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FranchiseRightsMember" xlink:label="Locator_us-gaap_FranchiseRightsMember_5268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5267" xlink:to="Locator_us-gaap_FranchiseRightsMember_5268" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5269" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_5270" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5269" xlink:to="Locator_cmcsa_NbcuniversalMember_5270" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5271" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_UncertainTaxPositionsIndemnifiedByGeMember" xlink:label="Locator_cmcsa_UncertainTaxPositionsIndemnifiedByGeMember_5272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5271" xlink:to="Locator_cmcsa_UncertainTaxPositionsIndemnifiedByGeMember_5272" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5273" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign" xlink:label="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_5274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5273" xlink:to="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_5274" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5275" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther" xlink:label="Locator_us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther_5276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5275" xlink:to="Locator_us-gaap_IncomeTaxEffectsAllocatedDirectlyToEquityOther_5276" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5277" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings" xlink:label="Locator_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_5278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5277" xlink:to="Locator_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_5278" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5279" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DeferredTaxLiabilityFranchiseRights" xlink:label="Locator_cmcsa_DeferredTaxLiabilityFranchiseRights_5280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5279" xlink:to="Locator_cmcsa_DeferredTaxLiabilityFranchiseRights_5280" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5281" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLossCarryforwards" xlink:label="Locator_us-gaap_OperatingLossCarryforwards_5282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5281" xlink:to="Locator_us-gaap_OperatingLossCarryforwards_5282" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5283" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingLossCarryforwardsExpirationDate" xlink:label="Locator_us-gaap_OperatingLossCarryforwardsExpirationDate_5284" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5283" xlink:to="Locator_us-gaap_OperatingLossCarryforwardsExpirationDate_5284" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5285" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LiabilityForUncertainTaxPositionsNoncurrent" xlink:label="Locator_us-gaap_LiabilityForUncertainTaxPositionsNoncurrent_5286" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5285" xlink:to="Locator_us-gaap_LiabilityForUncertainTaxPositionsNoncurrent_5286" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5287" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate" xlink:label="Locator_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_5288" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5287" xlink:to="Locator_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_5288" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5289" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued" xlink:label="Locator_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_5290" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5289" xlink:to="Locator_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_5290" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5291" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1" xlink:label="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1_5292" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5291" xlink:to="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1_5292" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5293" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AcquisitionOfNoncontrollingInterestAssociatedTaxes" xlink:label="Locator_cmcsa_AcquisitionOfNoncontrollingInterestAssociatedTaxes_5294" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5293" xlink:to="Locator_cmcsa_AcquisitionOfNoncontrollingInterestAssociatedTaxes_5294" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5295" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ChangeInIncomeTaxExpenseRelatedToEffectivelySettledUncertainTaxPositions" xlink:label="Locator_cmcsa_ChangeInIncomeTaxExpenseRelatedToEffectivelySettledUncertainTaxPositions_5296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5295" xlink:to="Locator_cmcsa_ChangeInIncomeTaxExpenseRelatedToEffectivelySettledUncertainTaxPositions_5296" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5297" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations" xlink:label="Locator_us-gaap_EffectiveIncomeTaxRateContinuingOperations_5298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5297" xlink:to="Locator_us-gaap_EffectiveIncomeTaxRateContinuingOperations_5298" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5299" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5299" xlink:to="Locator_us-gaap_StatementTable_5300" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureCondensedConsolidatingFinancialInformationNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5339" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeByNatureAxis" xlink:label="Locator_us-gaap_DerivativeByNatureAxis_5340" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5339" xlink:to="Locator_us-gaap_DerivativeByNatureAxis_5340" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeByNatureAxis" xlink:label="Locator_us-gaap_DerivativeByNatureAxis_5341" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="Locator_us-gaap_DerivativeNameDomain_5342" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DerivativeByNatureAxis_5341" xlink:to="Locator_us-gaap_DerivativeNameDomain_5342" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeByNatureAxis" xlink:label="Locator_us-gaap_DerivativeByNatureAxis_5367" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="Locator_us-gaap_DerivativeNameDomain_5368" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_DerivativeByNatureAxis_5367" xlink:to="Locator_us-gaap_DerivativeNameDomain_5368" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeNameDomain" xlink:label="Locator_us-gaap_DerivativeNameDomain_5343" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_5344" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DerivativeNameDomain_5343" xlink:to="Locator_us-gaap_DebtMember_5344" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_5345" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastHoldingsZonesDueOctober2029Member" xlink:label="Locator_cmcsa_ComcastHoldingsZonesDueOctober2029Member_5346" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_5345" xlink:to="Locator_cmcsa_ComcastHoldingsZonesDueOctober2029Member_5346" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_5347" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastHoldingsZonesDueNovember2029Member" xlink:label="Locator_cmcsa_ComcastHoldingsZonesDueNovember2029Member_5348" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_5347" xlink:to="Locator_cmcsa_ComcastHoldingsZonesDueNovember2029Member_5348" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_5349" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_GuarantorSubsidiariesMember" xlink:label="Locator_us-gaap_GuarantorSubsidiariesMember_5350" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_5349" xlink:to="Locator_us-gaap_GuarantorSubsidiariesMember_5350" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_5351" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MaturingInNextFiveYearsMember" xlink:label="Locator_cmcsa_MaturingInNextFiveYearsMember_5352" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_5351" xlink:to="Locator_cmcsa_MaturingInNextFiveYearsMember_5352" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_5353" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="Locator_us-gaap_RevolvingCreditFacilityMember_5354" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_5353" xlink:to="Locator_us-gaap_RevolvingCreditFacilityMember_5354" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_5355" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastAndComcastCableCommunicationsLlcMember" xlink:label="Locator_cmcsa_ComcastAndComcastCableCommunicationsLlcMember_5356" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_5355" xlink:to="Locator_cmcsa_ComcastAndComcastCableCommunicationsLlcMember_5356" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtMember" xlink:label="Locator_us-gaap_DebtMember_5357" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEnterpriseMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseMember_5358" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtMember_5357" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseMember_5358" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5361" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_GuaranteeObligationsCurrentPrincipalBalance" xlink:label="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_5362" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5361" xlink:to="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_5362" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5365" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NonGuaranteeObligationsCurrentPrincipalBalance" xlink:label="Locator_cmcsa_NonGuaranteeObligationsCurrentPrincipalBalance_5366" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5365" xlink:to="Locator_cmcsa_NonGuaranteeObligationsCurrentPrincipalBalance_5366" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5335" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5336" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5335" xlink:to="Locator_us-gaap_StatementTable_5336" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5363" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_5364" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5363" xlink:to="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_5364" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5359" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" xlink:label="Locator_us-gaap_DebtInstrumentMaturityDateDescription_5360" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5359" xlink:to="Locator_us-gaap_DebtInstrumentMaturityDateDescription_5360" order="1.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsInvestmentIncomeLossNetDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5421" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5422" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5421" xlink:to="Locator_dei_LegalEntityAxis_5422" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5423" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5424" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5423" xlink:to="Locator_dei_EntityDomain_5424" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5425" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5426" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5425" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5426" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5427" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RealizedInvestmentGainsLosses" xlink:label="Locator_us-gaap_RealizedInvestmentGainsLosses_5428" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5427" xlink:to="Locator_us-gaap_RealizedInvestmentGainsLosses_5428" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5429" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ImpairmentOfInvestments" xlink:label="Locator_us-gaap_ImpairmentOfInvestments_5430" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5429" xlink:to="Locator_us-gaap_ImpairmentOfInvestments_5430" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5431" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_UnrealizedGainLossOnSecurities" xlink:label="Locator_us-gaap_UnrealizedGainLossOnSecurities_5432" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5431" xlink:to="Locator_us-gaap_UnrealizedGainLossOnSecurities_5432" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5433" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MarkToMarketAdjustmentOnDerivativeComponentOfPrepaidForwardSaleAgreements" xlink:label="Locator_cmcsa_MarkToMarketAdjustmentOnDerivativeComponentOfPrepaidForwardSaleAgreements_5434" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5433" xlink:to="Locator_cmcsa_MarkToMarketAdjustmentOnDerivativeComponentOfPrepaidForwardSaleAgreements_5434" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5435" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet" xlink:label="Locator_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_5436" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5435" xlink:to="Locator_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_5436" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5437" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend" xlink:label="Locator_us-gaap_InvestmentIncomeInterestAndDividend_5438" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5437" xlink:to="Locator_us-gaap_InvestmentIncomeInterestAndDividend_5438" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5439" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherInvestmentIncomeLossNet" xlink:label="Locator_cmcsa_OtherInvestmentIncomeLossNet_5440" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5439" xlink:to="Locator_cmcsa_OtherInvestmentIncomeLossNet_5440" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5441" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="Locator_us-gaap_InvestmentIncomeNonoperating_5442" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5441" xlink:to="Locator_us-gaap_InvestmentIncomeNonoperating_5442" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5443" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5444" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5443" xlink:to="Locator_us-gaap_StatementTable_5444" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFilmAndTelevisionCosts">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5457" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5458" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5457" xlink:to="Locator_dei_LegalEntityAxis_5458" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5459" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5460" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5459" xlink:to="Locator_dei_EntityDomain_5460" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5461" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5462" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5461" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5462" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5463" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsDisclosureTextBlock" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDisclosureTextBlock_5464" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5463" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsDisclosureTextBlock_5464" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5465" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5466" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5465" xlink:to="Locator_us-gaap_StatementTable_5466" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5479" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5480" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5479" xlink:to="Locator_dei_LegalEntityAxis_5480" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5481" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5482" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5481" xlink:to="Locator_dei_EntityDomain_5482" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5483" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5484" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5483" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5484" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5485" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfFilmAndTelevisionCostsTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfFilmAndTelevisionCostsTableTextBlock_5486" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5485" xlink:to="Locator_cmcsa_ScheduleOfFilmAndTelevisionCostsTableTextBlock_5486" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5487" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5488" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5487" xlink:to="Locator_us-gaap_StatementTable_5488" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5507" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5508" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5507" xlink:to="Locator_dei_LegalEntityAxis_5508" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5509" xlink:to="Locator_dei_EntityDomain_5510" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5511" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5511" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5512" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5513" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AmortizationOfOriginalFilmAndTelevisionProductionExpectedToBeAmortizedDuringNextFiscalYear" xlink:label="Locator_cmcsa_AmortizationOfOriginalFilmAndTelevisionProductionExpectedToBeAmortizedDuringNextFiscalYear_5514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5513" xlink:to="Locator_cmcsa_AmortizationOfOriginalFilmAndTelevisionProductionExpectedToBeAmortizedDuringNextFiscalYear_5514" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5515" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ExpectedAmortizationPercentageOfCompletedNotReleasedAndUnamortizedFilmAndTelevisionCosts" xlink:label="Locator_cmcsa_ExpectedAmortizationPercentageOfCompletedNotReleasedAndUnamortizedFilmAndTelevisionCosts_5516" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5515" xlink:to="Locator_cmcsa_ExpectedAmortizationPercentageOfCompletedNotReleasedAndUnamortizedFilmAndTelevisionCosts_5516" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5517" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionLibraryCostsUnamortized" xlink:label="Locator_cmcsa_FilmAndTelevisionLibraryCostsUnamortized_5518" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5517" xlink:to="Locator_cmcsa_FilmAndTelevisionLibraryCostsUnamortized_5518" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5519" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears" xlink:label="Locator_cmcsa_PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears_5520" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5519" xlink:to="Locator_cmcsa_PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears_5520" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5521" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5522" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5521" xlink:to="Locator_us-gaap_StatementTable_5522" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureReceivablesMonetization">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5535" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5536" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5535" xlink:to="Locator_dei_LegalEntityAxis_5536" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5537" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5538" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5537" xlink:to="Locator_dei_EntityDomain_5538" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5539" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5540" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5539" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5540" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5541" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ReceivablesMonetizationTextBlock" xlink:label="Locator_cmcsa_ReceivablesMonetizationTextBlock_5542" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5541" xlink:to="Locator_cmcsa_ReceivablesMonetizationTextBlock_5542" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5543" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5544" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5543" xlink:to="Locator_us-gaap_StatementTable_5544" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFilmAndTelevisionCostsFilmAndTelevisionCostsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5601" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsAxis" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsAxis_5602" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5601" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsAxis_5602" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsAxis" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsAxis_5605" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsDomain" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDomain_5606" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsAxis_5605" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsDomain_5606" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsAxis" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsAxis_5641" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsDomain" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDomain_5642" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsAxis_5641" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsDomain_5642" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsDomain" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDomain_5607" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmCostsMember" xlink:label="Locator_cmcsa_FilmCostsMember_5608" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsDomain_5607" xlink:to="Locator_cmcsa_FilmCostsMember_5608" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsDomain" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsDomain_5609" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TelevisionCostsMember" xlink:label="Locator_cmcsa_TelevisionCostsMember_5610" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsDomain_5609" xlink:to="Locator_cmcsa_TelevisionCostsMember_5610" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5603" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5604" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5603" xlink:to="Locator_dei_LegalEntityAxis_5604" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5611" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5612" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5611" xlink:to="Locator_dei_EntityDomain_5612" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5613" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5614" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5613" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5614" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5567" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5568" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5567" xlink:to="Locator_us-gaap_StatementTable_5568" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5615" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5616" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5615" xlink:to="Locator_us-gaap_TheatricalFilmCostsAbstract_5616" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5617" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TheatricalFilmCostsReleased" xlink:label="Locator_us-gaap_TheatricalFilmCostsReleased_5618" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_TheatricalFilmCostsAbstract_5617" xlink:to="Locator_us-gaap_TheatricalFilmCostsReleased_5618" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5619" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TheatricalFilmCostsCompletedAndNotReleased" xlink:label="Locator_us-gaap_TheatricalFilmCostsCompletedAndNotReleased_5620" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_TheatricalFilmCostsAbstract_5619" xlink:to="Locator_us-gaap_TheatricalFilmCostsCompletedAndNotReleased_5620" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5621" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TheatricalFilmCostsInProductionAndInDevelopment" xlink:label="Locator_cmcsa_TheatricalFilmCostsInProductionAndInDevelopment_5622" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_TheatricalFilmCostsAbstract_5621" xlink:to="Locator_cmcsa_TheatricalFilmCostsInProductionAndInDevelopment_5622" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TheatricalFilmCostsAbstract" xlink:label="Locator_us-gaap_TheatricalFilmCostsAbstract_5623" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TheatricalFilmCosts" xlink:label="Locator_us-gaap_TheatricalFilmCosts_5624" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_TheatricalFilmCostsAbstract_5623" xlink:to="Locator_us-gaap_TheatricalFilmCosts_5624" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5625" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsAbstract" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5626" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5625" xlink:to="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5626" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsAbstract" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5627" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsReleased" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsReleased_5628" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5627" xlink:to="Locator_us-gaap_DirectToTelevisionFilmCostsReleased_5628" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsAbstract" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5629" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment" xlink:label="Locator_cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment_5630" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5629" xlink:to="Locator_cmcsa_DirectToTelevisionFilmCostsInProductionAndInDevelopment_5630" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DirectToTelevisionFilmCostsAbstract" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5631" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DirectToTelevisionFilmCosts" xlink:label="Locator_us-gaap_DirectToTelevisionFilmCosts_5632" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DirectToTelevisionFilmCostsAbstract_5631" xlink:to="Locator_us-gaap_DirectToTelevisionFilmCosts_5632" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5633" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingRightsLessAmortization" xlink:label="Locator_cmcsa_ProgrammingRightsLessAmortization_5634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5633" xlink:to="Locator_cmcsa_ProgrammingRightsLessAmortization_5634" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5635" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization" xlink:label="Locator_cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization_5636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5635" xlink:to="Locator_cmcsa_TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization_5636" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5637" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingRightsCurrent" xlink:label="Locator_cmcsa_ProgrammingRightsCurrent_5638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5637" xlink:to="Locator_cmcsa_ProgrammingRightsCurrent_5638" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsLineItems" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5639" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCosts" xlink:label="Locator_cmcsa_FilmAndTelevisionCosts_5640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FilmAndTelevisionCostsLineItems_5639" xlink:to="Locator_cmcsa_FilmAndTelevisionCosts_5640" order="6.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationReceivablesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5675" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5676" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5675" xlink:to="Locator_dei_LegalEntityAxis_5676" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5677" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5678" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5677" xlink:to="Locator_dei_EntityDomain_5678" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5679" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5680" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5679" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5680" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5681" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="Locator_us-gaap_AccountsReceivableGrossCurrent_5682" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5681" xlink:to="Locator_us-gaap_AccountsReceivableGrossCurrent_5682" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5683" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ReturnsAndIncentivesAllowance" xlink:label="Locator_cmcsa_ReturnsAndIncentivesAllowance_5684" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5683" xlink:to="Locator_cmcsa_ReturnsAndIncentivesAllowance_5684" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5685" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="Locator_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_5686" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5685" xlink:to="Locator_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_5686" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5687" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsReceivableNetNoncurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetNoncurrent_5688" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5687" xlink:to="Locator_us-gaap_AccountsReceivableNetNoncurrent_5688" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5689" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetCurrent_5690" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5689" xlink:to="Locator_us-gaap_AccountsReceivableNetCurrent_5690" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5691" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5692" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5691" xlink:to="Locator_us-gaap_StatementTable_5692" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationNetCashProvidedByOperatingActivitiesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5769" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5770" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5769" xlink:to="Locator_dei_LegalEntityAxis_5770" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5771" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5772" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5771" xlink:to="Locator_dei_EntityDomain_5772" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5773" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5774" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5773" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5774" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5777" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5778" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5777" xlink:to="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5778" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5779" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="Locator_us-gaap_DepreciationAndAmortization_5780" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5779" xlink:to="Locator_us-gaap_DepreciationAndAmortization_5780" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5781" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="Locator_us-gaap_ShareBasedCompensation_5782" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5781" xlink:to="Locator_us-gaap_ShareBasedCompensation_5782" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5783" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncashInterestExpenseIncomeNet" xlink:label="Locator_cmcsa_NoncashInterestExpenseIncomeNet_5784" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5783" xlink:to="Locator_cmcsa_NoncashInterestExpenseIncomeNet_5784" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5785" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_5786" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5785" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_5786" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5787" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions" xlink:label="Locator_us-gaap_EquityMethodInvestmentDividendsOrDistributions_5788" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5787" xlink:to="Locator_us-gaap_EquityMethodInvestmentDividendsOrDistributions_5788" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5789" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet" xlink:label="Locator_cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet_5790" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5789" xlink:to="Locator_cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet_5790" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5791" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_DeferredIncomeTaxExpenseBenefit_5792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5791" xlink:to="Locator_us-gaap_DeferredIncomeTaxExpenseBenefit_5792" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5793" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5793" xlink:to="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5794" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5795" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet" xlink:label="Locator_cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet_5796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5795" xlink:to="Locator_cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet_5796" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5797" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FilmAndTelevisionCostsNet" xlink:label="Locator_cmcsa_FilmAndTelevisionCostsNet_5798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5797" xlink:to="Locator_cmcsa_FilmAndTelevisionCostsNet_5798" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5799" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="Locator_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_5800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5799" xlink:to="Locator_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_5800" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5801" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IncreaseDecreaseInAccruedParticipationsAndResidualsProgramObligationsAndDeferredRevenue" xlink:label="Locator_cmcsa_IncreaseDecreaseInAccruedParticipationsAndResidualsProgramObligationsAndDeferredRevenue_5802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5801" xlink:to="Locator_cmcsa_IncreaseDecreaseInAccruedParticipationsAndResidualsProgramObligationsAndDeferredRevenue_5802" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5803" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="Locator_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_5804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_5803" xlink:to="Locator_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_5804" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5805" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_5806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_5805" xlink:to="Locator_us-gaap_NetCashProvidedByUsedInOperatingActivities_5806" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5807" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AmortizationOfFilmAndTelevisionCosts" xlink:label="Locator_cmcsa_AmortizationOfFilmAndTelevisionCosts_5808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5807" xlink:to="Locator_cmcsa_AmortizationOfFilmAndTelevisionCosts_5808" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5809" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ChangeInFilmAndTelevisionCosts" xlink:label="Locator_cmcsa_ChangeInFilmAndTelevisionCosts_5810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5809" xlink:to="Locator_cmcsa_ChangeInFilmAndTelevisionCosts_5810" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5775" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_5776" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5775" xlink:to="Locator_us-gaap_ProfitLoss_5776" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5729" xlink:to="Locator_us-gaap_StatementTable_5730" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSupplementalFinancialInformationCashPaymentsForInterestAndIncomeTaxesDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5823" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5824" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5823" xlink:to="Locator_dei_LegalEntityAxis_5824" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5825" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5826" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5825" xlink:to="Locator_dei_EntityDomain_5826" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5827" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5828" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5827" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5828" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5829" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="Locator_us-gaap_InterestPaidNet_5830" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5829" xlink:to="Locator_us-gaap_InterestPaidNet_5830" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5831" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="Locator_us-gaap_IncomeTaxesPaidNet_5832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_5831" xlink:to="Locator_us-gaap_IncomeTaxesPaidNet_5832" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_5833" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5834" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_5833" xlink:to="Locator_us-gaap_StatementTable_5834" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsComponentsOfBenefitsExpenseDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5861" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="Locator_us-gaap_DefinedBenefitPlanServiceCost_5862" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5861" xlink:to="Locator_us-gaap_DefinedBenefitPlanServiceCost_5862" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5863" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="Locator_us-gaap_DefinedBenefitPlanInterestCost_5864" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5863" xlink:to="Locator_us-gaap_DefinedBenefitPlanInterestCost_5864" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5865" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit" xlink:label="Locator_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_5866" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5865" xlink:to="Locator_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_5866" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5867" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanOtherCosts" xlink:label="Locator_us-gaap_DefinedBenefitPlanOtherCosts_5868" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5867" xlink:to="Locator_us-gaap_DefinedBenefitPlanOtherCosts_5868" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5869" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherPostretirementBenefitExpense" xlink:label="Locator_us-gaap_OtherPostretirementBenefitExpense_5870" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5869" xlink:to="Locator_us-gaap_OtherPostretirementBenefitExpense_5870" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5871" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionExpense" xlink:label="Locator_us-gaap_PensionExpense_5872" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5871" xlink:to="Locator_us-gaap_PensionExpense_5872" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5873" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionContributions" xlink:label="Locator_us-gaap_PensionContributions_5874" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5873" xlink:to="Locator_us-gaap_PensionContributions_5874" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5875" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets" xlink:label="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_5876" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5875" xlink:to="Locator_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_5876" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5877" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5878" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5877" xlink:to="Locator_us-gaap_StatementTable_5878" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5879" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5880" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5879" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5880" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5881" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5882" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5881" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_5882" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5883" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_PensionPlansDefinedBenefitMember_5884" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_5883" xlink:to="Locator_us-gaap_PensionPlansDefinedBenefitMember_5884" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5885" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5886" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5885" xlink:to="Locator_dei_LegalEntityAxis_5886" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5887" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5888" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5887" xlink:to="Locator_dei_EntityDomain_5888" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5889" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5890" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5889" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5890" order="1.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosurePensionPlansAndPostretirementBenefitsExpectedFutureBenefitPaymentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5919" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5920" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5919" xlink:to="Locator_us-gaap_StatementTable_5920" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5921" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5922" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5921" xlink:to="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5922" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5923" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5924" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_5923" xlink:to="Locator_us-gaap_DefinedBenefitPlansDomain_5924" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5925" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_5926" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_5925" xlink:to="Locator_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_5926" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="Locator_us-gaap_DefinedBenefitPlansDomain_5927" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember" xlink:label="Locator_us-gaap_PensionPlansDefinedBenefitMember_5928" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlansDomain_5927" xlink:to="Locator_us-gaap_PensionPlansDefinedBenefitMember_5928" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5929" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5930" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5929" xlink:to="Locator_dei_LegalEntityAxis_5930" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5931" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5932" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5931" xlink:to="Locator_dei_EntityDomain_5932" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5933" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5934" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5933" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5934" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5935" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_5936" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5935" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_5936" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5937" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_5938" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5937" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_5938" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5939" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_5940" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5939" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_5940" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5941" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_5942" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5941" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_5942" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5943" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_5944" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5943" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_5944" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5945" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter" xlink:label="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_5946" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DefinedBenefitPlanDisclosureLineItems_5945" xlink:to="Locator_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_5946" order="6.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5977" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5978" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5977" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5978" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5981" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5982" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5981" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5982" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5999" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_6000" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesTypeAxis_5999" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesDomain_6000" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5983" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsMember" xlink:label="Locator_us-gaap_AllowanceForDoubtfulAccountsMember_5984" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5983" xlink:to="Locator_us-gaap_AllowanceForDoubtfulAccountsMember_5984" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5985" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AllowanceForSalesReturnsMember" xlink:label="Locator_us-gaap_AllowanceForSalesReturnsMember_5986" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5985" xlink:to="Locator_us-gaap_AllowanceForSalesReturnsMember_5986" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5987" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember" xlink:label="Locator_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_5988" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAllowancesAndReservesDomain_5987" xlink:to="Locator_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_5988" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5979" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5980" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_5979" xlink:to="Locator_dei_LegalEntityAxis_5980" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_5989" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5990" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_5989" xlink:to="Locator_dei_EntityDomain_5990" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_5991" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_5992" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_5991" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_5992" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5973" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_5974" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5973" xlink:to="Locator_us-gaap_StatementTable_5974" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5993" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesBalance_5994" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5993" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesBalance_5994" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5995" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_5996" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5995" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_5996" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5997" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions" xlink:label="Locator_us-gaap_ValuationAllowancesAndReservesDeductions_5998" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_5997" xlink:to="Locator_us-gaap_ValuationAllowancesAndReservesDeductions_5998" order="3.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccountsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6021" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6022" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6021" xlink:to="Locator_dei_LegalEntityAxis_6022" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6023" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6024" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6023" xlink:to="Locator_dei_EntityDomain_6024" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6025" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6026" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6025" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6026" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6027" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlock" xlink:label="Locator_cmcsa_ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlock_6028" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6027" xlink:to="Locator_cmcsa_ScheduleOfValuationAndQualifyingAccountsDisclosureTableTextBlock_6028" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6029" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6030" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6029" xlink:to="Locator_us-gaap_StatementTable_6030" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureScheduleIIValuationAndQualifyingAccounts">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6043" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6044" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6043" xlink:to="Locator_dei_LegalEntityAxis_6044" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6045" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6046" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6045" xlink:to="Locator_dei_EntityDomain_6046" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6047" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6048" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6047" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6048" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6049" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock" xlink:label="Locator_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_6050" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6049" xlink:to="Locator_us-gaap_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock_6050" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6051" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6052" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6051" xlink:to="Locator_us-gaap_StatementTable_6052" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureFairValueDisclosureRollforwardDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6087" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="Locator_us-gaap_FairValueByLiabilityClassAxis_6088" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6087" xlink:to="Locator_us-gaap_FairValueByLiabilityClassAxis_6088" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="Locator_us-gaap_FairValueByLiabilityClassAxis_6091" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_6092" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_FairValueByLiabilityClassAxis_6091" xlink:to="Locator_cmcsa_FairValueInputsLevel3Domain_6092" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="Locator_us-gaap_FairValueByLiabilityClassAxis_6129" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_6130" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_FairValueByLiabilityClassAxis_6129" xlink:to="Locator_cmcsa_FairValueInputsLevel3Domain_6130" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_6093" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ObligationsMember" xlink:label="Locator_us-gaap_ObligationsMember_6094" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_6093" xlink:to="Locator_us-gaap_ObligationsMember_6094" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_6095" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ContingentConsiderationMember" xlink:label="Locator_cmcsa_ContingentConsiderationMember_6096" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_6095" xlink:to="Locator_cmcsa_ContingentConsiderationMember_6096" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_6097" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueOfSpecificContractObligationMember" xlink:label="Locator_cmcsa_FairValueOfSpecificContractObligationMember_6098" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_6097" xlink:to="Locator_cmcsa_FairValueOfSpecificContractObligationMember_6098" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_6099" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ContractualObligationAndContingentConsiderationDiscountRatesMember" xlink:label="Locator_cmcsa_ContractualObligationAndContingentConsiderationDiscountRatesMember_6100" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_6099" xlink:to="Locator_cmcsa_ContractualObligationAndContingentConsiderationDiscountRatesMember_6100" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_6101" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MaximumMember" xlink:label="Locator_us-gaap_MaximumMember_6102" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_6101" xlink:to="Locator_us-gaap_MaximumMember_6102" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueInputsLevel3Domain" xlink:label="Locator_cmcsa_FairValueInputsLevel3Domain_6103" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MinimumMember" xlink:label="Locator_us-gaap_MinimumMember_6104" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_FairValueInputsLevel3Domain_6103" xlink:to="Locator_us-gaap_MinimumMember_6104" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6089" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6090" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6089" xlink:to="Locator_dei_LegalEntityAxis_6090" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6105" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6106" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6105" xlink:to="Locator_dei_EntityDomain_6106" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6109" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEnterpriseMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseMember_6110" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6109" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseMember_6110" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6107" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6108" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6107" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6108" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6111" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_6112" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6111" xlink:to="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_6112" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6113" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisAcquisitionAccountingAdjustments" xlink:label="Locator_cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisAcquisitionAccountingAdjustments_6114" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6113" xlink:to="Locator_cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisAcquisitionAccountingAdjustments_6114" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6115" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease" xlink:label="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_6116" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6115" xlink:to="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease_6116" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6117" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements" xlink:label="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_6118" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6117" xlink:to="Locator_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_6118" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6119" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisRedemptionTransaction" xlink:label="Locator_cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisRedemptionTransaction_6120" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6119" xlink:to="Locator_cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisRedemptionTransaction_6120" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6121" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLibertyMediaTransaction" xlink:label="Locator_cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLibertyMediaTransaction_6122" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6121" xlink:to="Locator_cmcsa_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLibertyMediaTransaction_6122" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6123" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FairValueInputsDiscountRate" xlink:label="Locator_us-gaap_FairValueInputsDiscountRate_6124" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6123" xlink:to="Locator_us-gaap_FairValueInputsDiscountRate_6124" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6125" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="Locator_us-gaap_AssetImpairmentCharges_6126" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6125" xlink:to="Locator_us-gaap_AssetImpairmentCharges_6126" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6127" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_FairValueAmountOfRedeemablePreferredShares" xlink:label="Locator_cmcsa_FairValueAmountOfRedeemablePreferredShares_6128" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6127" xlink:to="Locator_cmcsa_FairValueAmountOfRedeemablePreferredShares_6128" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6083" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6084" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6083" xlink:to="Locator_us-gaap_StatementTable_6084" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSignificantTransactionsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6213" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_6214" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6213" xlink:to="Locator_us-gaap_BusinessAcquisitionAxis_6214" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_6217" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6218" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_BusinessAcquisitionAxis_6217" xlink:to="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6218" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="Locator_us-gaap_BusinessAcquisitionAxis_6317" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6318" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_BusinessAcquisitionAxis_6317" xlink:to="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6318" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6219" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastCorporationMember" xlink:label="Locator_cmcsa_ComcastCorporationMember_6220" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6219" xlink:to="Locator_cmcsa_ComcastCorporationMember_6220" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6221" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalMember" xlink:label="Locator_cmcsa_NbcuniversalMember_6222" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6221" xlink:to="Locator_cmcsa_NbcuniversalMember_6222" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6223" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SeniorNotesMember" xlink:label="Locator_us-gaap_SeniorNotesMember_6224" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6223" xlink:to="Locator_us-gaap_SeniorNotesMember_6224" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6225" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="Locator_us-gaap_CommercialPaperMember_6226" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6225" xlink:to="Locator_us-gaap_CommercialPaperMember_6226" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6227" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="Locator_us-gaap_RevolvingCreditFacilityMember_6228" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6227" xlink:to="Locator_us-gaap_RevolvingCreditFacilityMember_6228" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6229" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="Locator_us-gaap_PreferredStockMember_6230" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6229" xlink:to="Locator_us-gaap_PreferredStockMember_6230" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6231" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalHoldingsPreferredStockMember" xlink:label="Locator_cmcsa_NbcuniversalHoldingsPreferredStockMember_6232" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6231" xlink:to="Locator_cmcsa_NbcuniversalHoldingsPreferredStockMember_6232" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6233" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ThirtyRockefellerPlazaAndEnglewoodCliffsMember" xlink:label="Locator_cmcsa_ThirtyRockefellerPlazaAndEnglewoodCliffsMember_6234" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6233" xlink:to="Locator_cmcsa_ThirtyRockefellerPlazaAndEnglewoodCliffsMember_6234" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6235" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEnterpriseMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseMember_6236" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6235" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseMember_6236" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6237" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalTransactionMember" xlink:label="Locator_cmcsa_NBCUniversalTransactionMember_6238" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6237" xlink:to="Locator_cmcsa_NBCUniversalTransactionMember_6238" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6239" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ThemeParksSegmentMember" xlink:label="Locator_cmcsa_ThemeParksSegmentMember_6240" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6239" xlink:to="Locator_cmcsa_ThemeParksSegmentMember_6240" order="11.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6241" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedemptionTransactionMember" xlink:label="Locator_cmcsa_RedemptionTransactionMember_6242" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6241" xlink:to="Locator_cmcsa_RedemptionTransactionMember_6242" order="12.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6243" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MergerAgreementUndertakingNumberOfDivestedCustomersMember" xlink:label="Locator_cmcsa_MergerAgreementUndertakingNumberOfDivestedCustomersMember_6244" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6243" xlink:to="Locator_cmcsa_MergerAgreementUndertakingNumberOfDivestedCustomersMember_6244" order="13.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6245" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DivestitureTransactionsNetDispositionOfCustomersMember" xlink:label="Locator_cmcsa_DivestitureTransactionsNetDispositionOfCustomersMember_6246" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6245" xlink:to="Locator_cmcsa_DivestitureTransactionsNetDispositionOfCustomersMember_6246" order="14.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6247" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DivestitureTransactionsCustomersToBeSpunOffInSpinCoMember" xlink:label="Locator_cmcsa_DivestitureTransactionsCustomersToBeSpunOffInSpinCoMember_6248" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6247" xlink:to="Locator_cmcsa_DivestitureTransactionsCustomersToBeSpunOffInSpinCoMember_6248" order="15.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6249" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DivestitureTransactionsLikeKindDivestitureOfTimeWarnerCableCustomersMember" xlink:label="Locator_cmcsa_DivestitureTransactionsLikeKindDivestitureOfTimeWarnerCableCustomersMember_6250" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6249" xlink:to="Locator_cmcsa_DivestitureTransactionsLikeKindDivestitureOfTimeWarnerCableCustomersMember_6250" order="16.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6251" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DivestitureTransactionsLikeKindReceiptOfCharterCommunicationsCustomersMember" xlink:label="Locator_cmcsa_DivestitureTransactionsLikeKindReceiptOfCharterCommunicationsCustomersMember_6252" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6251" xlink:to="Locator_cmcsa_DivestitureTransactionsLikeKindReceiptOfCharterCommunicationsCustomersMember_6252" order="17.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6253" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DivestitureTransactionsSaleOfTimeWarnerCableCustomersMember" xlink:label="Locator_cmcsa_DivestitureTransactionsSaleOfTimeWarnerCableCustomersMember_6254" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6253" xlink:to="Locator_cmcsa_DivestitureTransactionsSaleOfTimeWarnerCableCustomersMember_6254" order="18.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6255" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastCorporateShareholdersMember" xlink:label="Locator_cmcsa_ComcastCorporateShareholdersMember_6256" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6255" xlink:to="Locator_cmcsa_ComcastCorporateShareholdersMember_6256" order="19.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6257" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NewCharterMember" xlink:label="Locator_cmcsa_NewCharterMember_6258" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6257" xlink:to="Locator_cmcsa_NewCharterMember_6258" order="20.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6259" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_TransactionRelatedExpensesMember" xlink:label="Locator_cmcsa_TransactionRelatedExpensesMember_6260" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_BusinessAcquisitionAcquireeDomain_6259" xlink:to="Locator_cmcsa_TransactionRelatedExpensesMember_6260" order="21.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6215" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6216" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6215" xlink:to="Locator_dei_LegalEntityAxis_6216" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6261" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6262" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6261" xlink:to="Locator_dei_EntityDomain_6262" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6263" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6264" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6263" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6264" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6209" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6210" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6209" xlink:to="Locator_us-gaap_StatementTable_6210" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6265" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries" xlink:label="Locator_cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries_6266" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6265" xlink:to="Locator_cmcsa_ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries_6266" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6267" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PaymentsRelatedToAcquisitionOfBuildings" xlink:label="Locator_cmcsa_PaymentsRelatedToAcquisitionOfBuildings_6268" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6267" xlink:to="Locator_cmcsa_PaymentsRelatedToAcquisitionOfBuildings_6268" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6269" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource" xlink:label="Locator_cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource_6270" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6269" xlink:to="Locator_cmcsa_ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource_6270" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6271" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PortionOfConsiderationTransferredFundedByNbcuniversal" xlink:label="Locator_cmcsa_PortionOfConsiderationTransferredFundedByNbcuniversal_6272" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6271" xlink:to="Locator_cmcsa_PortionOfConsiderationTransferredFundedByNbcuniversal_6272" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6273" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="Locator_us-gaap_PreferredStockDividendRatePercentage_6274" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6273" xlink:to="Locator_us-gaap_PreferredStockDividendRatePercentage_6274" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6275" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockLiquidationPreferenceValue" xlink:label="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_6276" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6275" xlink:to="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_6276" order="6.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6277" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PreferredStockDividendResetRatePercentage" xlink:label="Locator_cmcsa_PreferredStockDividendResetRatePercentage_6278" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6277" xlink:to="Locator_cmcsa_PreferredStockDividendResetRatePercentage_6278" order="7.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6279" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_DeferredTaxLiabilitiesTransactionIncrease" xlink:label="Locator_cmcsa_DeferredTaxLiabilitiesTransactionIncrease_6280" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6279" xlink:to="Locator_cmcsa_DeferredTaxLiabilitiesTransactionIncrease_6280" order="8.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6281" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OwnershipPercentageInSpinco" xlink:label="Locator_cmcsa_OwnershipPercentageInSpinco_6282" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6281" xlink:to="Locator_cmcsa_OwnershipPercentageInSpinco_6282" order="9.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6283" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OwnershipPercentageInNewCharter" xlink:label="Locator_cmcsa_OwnershipPercentageInNewCharter_6284" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6283" xlink:to="Locator_cmcsa_OwnershipPercentageInNewCharter_6284" order="10.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6285" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CashPaidToAcquireEntityIncludingTransactionRelatedCosts" xlink:label="Locator_cmcsa_CashPaidToAcquireEntityIncludingTransactionRelatedCosts_6286" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6285" xlink:to="Locator_cmcsa_CashPaidToAcquireEntityIncludingTransactionRelatedCosts_6286" order="11.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6287" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1" xlink:label="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1_6288" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6287" xlink:to="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxesAssetLiabilityNet1_6288" order="12.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6289" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount1" xlink:label="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount1_6290" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6289" xlink:to="Locator_cmcsa_BusinessAcquisitionPurchasePriceAllocationGoodwillAmount1_6290" order="13.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6291" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NoncontrollingInterestAcquired" xlink:label="Locator_cmcsa_NoncontrollingInterestAcquired_6292" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6291" xlink:to="Locator_cmcsa_NoncontrollingInterestAcquired_6292" order="14.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6293" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual" xlink:label="Locator_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_6294" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6293" xlink:to="Locator_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_6294" order="15.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6295" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual" xlink:label="Locator_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_6296" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6295" xlink:to="Locator_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_6296" order="16.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6297" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OwnershipPercentage" xlink:label="Locator_cmcsa_OwnershipPercentage_6298" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6297" xlink:to="Locator_cmcsa_OwnershipPercentage_6298" order="17.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6299" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RedemptionPercentage" xlink:label="Locator_cmcsa_RedemptionPercentage_6300" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6299" xlink:to="Locator_cmcsa_RedemptionPercentage_6300" order="18.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6301" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_BusinessAcquisitionCostOfAcquiredEntityCashPaidNet1" xlink:label="Locator_cmcsa_BusinessAcquisitionCostOfAcquiredEntityCashPaidNet1_6302" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6301" xlink:to="Locator_cmcsa_BusinessAcquisitionCostOfAcquiredEntityCashPaidNet1_6302" order="19.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6303" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_BusinessAcquisitionCashAndCashEquivalents" xlink:label="Locator_cmcsa_BusinessAcquisitionCashAndCashEquivalents_6304" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6303" xlink:to="Locator_cmcsa_BusinessAcquisitionCashAndCashEquivalents_6304" order="20.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6305" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_GuaranteeObligationsCurrentPrincipalBalance" xlink:label="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_6306" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6305" xlink:to="Locator_cmcsa_GuaranteeObligationsCurrentPrincipalBalance_6306" order="21.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6307" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_AcquireeStockholdersPercentageOwnershipInParentCompany" xlink:label="Locator_cmcsa_AcquireeStockholdersPercentageOwnershipInParentCompany_6308" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6307" xlink:to="Locator_cmcsa_AcquireeStockholdersPercentageOwnershipInParentCompany_6308" order="22.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6309" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NumberOfCustomers" xlink:label="Locator_cmcsa_NumberOfCustomers_6310" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6309" xlink:to="Locator_cmcsa_NumberOfCustomers_6310" order="23.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6311" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_MultipleValueOfExchangeAndSaleTransactions" xlink:label="Locator_cmcsa_MultipleValueOfExchangeAndSaleTransactions_6312" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6311" xlink:to="Locator_cmcsa_MultipleValueOfExchangeAndSaleTransactions_6312" order="24.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6313" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:label="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_6314" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6313" xlink:to="Locator_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_6314" order="25.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_SignificantTransactionsLineItems" xlink:label="Locator_cmcsa_SignificantTransactionsLineItems_6315" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Transactioncostsandtransactionrelatedcostsinoperatingcostsandexpenses" xlink:label="Locator_cmcsa_Transactioncostsandtransactionrelatedcostsinoperatingcostsandexpenses_6316" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_SignificantTransactionsLineItems_6315" xlink:to="Locator_cmcsa_Transactioncostsandtransactionrelatedcostsinoperatingcostsandexpenses_6316" order="26.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureGoodwillAndIntangibleAssetsIntangibleAssetsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6381" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6382" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6381" xlink:to="Locator_dei_EntityDomain_6382" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6383" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6384" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6383" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6384" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6385" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfIntangibleAssetsTable" xlink:label="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_6386" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6385" xlink:to="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_6386" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfIntangibleAssetsTable" xlink:label="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_6387" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsByMajorClassAxis" xlink:label="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_6388" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_6387" xlink:to="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_6388" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsByMajorClassAxis" xlink:label="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_6389" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6390" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_6389" xlink:to="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6390" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsByMajorClassAxis" xlink:label="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_6391" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6392" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_cmcsa_IntangibleAssetsByMajorClassAxis_6391" xlink:to="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6392" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6393" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="Locator_us-gaap_CustomerRelationshipsMember_6394" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6393" xlink:to="Locator_us-gaap_CustomerRelationshipsMember_6394" order="1.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6395" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember" xlink:label="Locator_us-gaap_ComputerSoftwareIntangibleAssetMember_6396" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6395" xlink:to="Locator_us-gaap_ComputerSoftwareIntangibleAssetMember_6396" order="2.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6397" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherIntangibleAssetsMember" xlink:label="Locator_us-gaap_OtherIntangibleAssetsMember_6398" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6397" xlink:to="Locator_us-gaap_OtherIntangibleAssetsMember_6398" order="3.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6399" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="Locator_us-gaap_TradeNamesMember_6400" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6399" xlink:to="Locator_us-gaap_TradeNamesMember_6400" order="4.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6401" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_LicensingAgreementsMember" xlink:label="Locator_us-gaap_LicensingAgreementsMember_6402" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6401" xlink:to="Locator_us-gaap_LicensingAgreementsMember_6402" order="5.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6403" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CableFranchiseRenewalCostsAndContractualOperatingRightsMember" xlink:label="Locator_cmcsa_CableFranchiseRenewalCostsAndContractualOperatingRightsMember_6404" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6403" xlink:to="Locator_cmcsa_CableFranchiseRenewalCostsAndContractualOperatingRightsMember_6404" order="6.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsMajorClassNameDomain" xlink:label="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6405" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_PatentsAndOtherTechnologyRightsMember" xlink:label="Locator_cmcsa_PatentsAndOtherTechnologyRightsMember_6406" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_cmcsa_IntangibleAssetsMajorClassNameDomain_6405" xlink:to="Locator_cmcsa_PatentsAndOtherTechnologyRightsMember_6406" order="7.0" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ScheduleOfIntangibleAssetsTable" xlink:label="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_6407" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6408" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_cmcsa_ScheduleOfIntangibleAssetsTable_6407" xlink:to="Locator_dei_LegalEntityAxis_6408" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6409" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill" xlink:label="Locator_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_6410" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6409" xlink:to="Locator_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_6410" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6411" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetsGross_6412" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6411" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetsGross_6412" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6413" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_IntangibleAssetsGross" xlink:label="Locator_cmcsa_IntangibleAssetsGross_6414" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6413" xlink:to="Locator_cmcsa_IntangibleAssetsGross_6414" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6415" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="Locator_us-gaap_FiniteLivedIntangibleAssetUsefulLife_6416" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6415" xlink:to="Locator_us-gaap_FiniteLivedIntangibleAssetUsefulLife_6416" order="4.0" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureSubsequentEvents">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6449" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6450" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6449" xlink:to="Locator_dei_LegalEntityAxis_6450" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6451" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6452" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6451" xlink:to="Locator_dei_EntityDomain_6452" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6453" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6454" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6453" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6454" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6455" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:label="Locator_us-gaap_SubsequentEventsTextBlock_6456" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6455" xlink:to="Locator_us-gaap_SubsequentEventsTextBlock_6456" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6457" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6458" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6457" xlink:to="Locator_us-gaap_StatementTable_6458" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsNarrativeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6485" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6486" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6485" xlink:to="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6486" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6489" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6490" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6489" xlink:to="Locator_us-gaap_RelatedPartyDomain_6490" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6513" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6514" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6513" xlink:to="Locator_us-gaap_RelatedPartyDomain_6514" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6491" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalHoldingsPreferredStockMember" xlink:label="Locator_cmcsa_NbcuniversalHoldingsPreferredStockMember_6492" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6491" xlink:to="Locator_cmcsa_NbcuniversalHoldingsPreferredStockMember_6492" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6493" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CarryingValueOfRelatedPartyContractualObligationMember" xlink:label="Locator_cmcsa_CarryingValueOfRelatedPartyContractualObligationMember_6494" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6493" xlink:to="Locator_cmcsa_CarryingValueOfRelatedPartyContractualObligationMember_6494" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6495" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastCorporationAndNBCUniversalMediaLLCRevolvingCreditAgreementMember" xlink:label="Locator_cmcsa_ComcastCorporationAndNBCUniversalMediaLLCRevolvingCreditAgreementMember_6496" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6495" xlink:to="Locator_cmcsa_ComcastCorporationAndNBCUniversalMediaLLCRevolvingCreditAgreementMember_6496" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6487" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6488" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6487" xlink:to="Locator_dei_LegalEntityAxis_6488" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6497" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6498" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6497" xlink:to="Locator_dei_EntityDomain_6498" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6499" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6500" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6499" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6500" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6501" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockLiquidationPreferenceValue" xlink:label="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_6502" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6501" xlink:to="Locator_us-gaap_PreferredStockLiquidationPreferenceValue_6502" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6503" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_RevolvingCreditAgreementCapacity" xlink:label="Locator_cmcsa_RevolvingCreditAgreementCapacity_6504" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6503" xlink:to="Locator_cmcsa_RevolvingCreditAgreementCapacity_6504" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6505" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_PreferredStockDividendRatePercentage" xlink:label="Locator_us-gaap_PreferredStockDividendRatePercentage_6506" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6505" xlink:to="Locator_us-gaap_PreferredStockDividendRatePercentage_6506" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6507" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt" xlink:label="Locator_cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt_6508" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6507" xlink:to="Locator_cmcsa_CollateralLiabilityForUnconsolidatedSubsidiaryDebt_6508" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6509" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="Locator_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6510" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6509" xlink:to="Locator_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_6510" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6511" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_OtherLiabilitiesNoncurrent_6512" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6511" xlink:to="Locator_us-gaap_OtherLiabilitiesNoncurrent_6512" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6481" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6482" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6481" xlink:to="Locator_us-gaap_StatementTable_6482" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsConsolidatedBalanceSheetDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6549" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6550" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6549" xlink:to="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6550" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6553" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6554" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6553" xlink:to="Locator_us-gaap_RelatedPartyDomain_6554" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6555" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastAndConsolidatedSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastAndConsolidatedSubsidiariesMember_6556" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6555" xlink:to="Locator_cmcsa_ComcastAndConsolidatedSubsidiariesMember_6556" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6551" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6552" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6551" xlink:to="Locator_dei_LegalEntityAxis_6552" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6557" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6558" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6557" xlink:to="Locator_dei_EntityDomain_6558" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6559" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6560" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6559" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6560" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6561" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="Locator_us-gaap_AccountsReceivableNetCurrent_6562" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6561" xlink:to="Locator_us-gaap_AccountsReceivableNetCurrent_6562" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6563" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NotesReceivableFromParent" xlink:label="Locator_cmcsa_NotesReceivableFromParent_6564" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6563" xlink:to="Locator_cmcsa_NotesReceivableFromParent_6564" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6565" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="Locator_us-gaap_AccountsPayableCurrent_6566" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6565" xlink:to="Locator_us-gaap_AccountsPayableCurrent_6566" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6567" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="Locator_us-gaap_AccruedLiabilitiesCurrent_6568" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6567" xlink:to="Locator_us-gaap_AccruedLiabilitiesCurrent_6568" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6569" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NotePayableToParent" xlink:label="Locator_cmcsa_NotePayableToParent_6570" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6569" xlink:to="Locator_cmcsa_NotePayableToParent_6570" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6571" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="Locator_us-gaap_OtherLiabilitiesNoncurrent_6572" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6571" xlink:to="Locator_us-gaap_OtherLiabilitiesNoncurrent_6572" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6545" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6546" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6545" xlink:to="Locator_us-gaap_StatementTable_6546" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsConsolidatedStatementOfIncomeDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6593" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6594" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6593" xlink:to="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6594" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6595" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6596" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6595" xlink:to="Locator_us-gaap_RelatedPartyDomain_6596" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="Locator_us-gaap_RelatedPartyDomain_6597" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ComcastAndConsolidatedSubsidiariesMember" xlink:label="Locator_cmcsa_ComcastAndConsolidatedSubsidiariesMember_6598" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_RelatedPartyDomain_6597" xlink:to="Locator_cmcsa_ComcastAndConsolidatedSubsidiariesMember_6598" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6599" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6600" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6599" xlink:to="Locator_dei_LegalEntityAxis_6600" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6601" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6602" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6601" xlink:to="Locator_dei_EntityDomain_6602" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6603" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6604" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6603" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6604" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6605" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OperatingExpensesExcludingDepreciationAndAmortization" xlink:label="Locator_cmcsa_OperatingExpensesExcludingDepreciationAndAmortization_6606" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6605" xlink:to="Locator_cmcsa_OperatingExpensesExcludingDepreciationAndAmortization_6606" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6607" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherIncomeExpenseRelatedParty" xlink:label="Locator_cmcsa_OtherIncomeExpenseRelatedParty_6608" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6607" xlink:to="Locator_cmcsa_OtherIncomeExpenseRelatedParty_6608" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6609" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_6610" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6609" xlink:to="Locator_us-gaap_Revenues_6610" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6611" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6612" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6611" xlink:to="Locator_us-gaap_StatementTable_6612" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureRelatedPartyTransactionsTables">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6631" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6632" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6631" xlink:to="Locator_dei_LegalEntityAxis_6632" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6633" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6634" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6633" xlink:to="Locator_dei_EntityDomain_6634" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6635" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6636" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6635" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6636" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6637" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock" xlink:label="Locator_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_6638" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6637" xlink:to="Locator_us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock_6638" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6639" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6640" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6639" xlink:to="Locator_us-gaap_StatementTable_6640" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureRelatedPartyTransactions">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6653" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6654" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6653" xlink:to="Locator_dei_LegalEntityAxis_6654" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6655" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6656" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6655" xlink:to="Locator_dei_EntityDomain_6656" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6657" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6658" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6657" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6658" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6659" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RelatedPartyTransactionsDisclosureTextBlock" xlink:label="Locator_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_6660" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6659" xlink:to="Locator_us-gaap_RelatedPartyTransactionsDisclosureTextBlock_6660" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6661" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6662" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6661" xlink:to="Locator_us-gaap_StatementTable_6662" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/DisclosureInvestmentsEquityMethodInvestmentsSummarizedFinancialInformationDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6703" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6704" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6703" xlink:to="Locator_dei_LegalEntityAxis_6704" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6705" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6706" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6705" xlink:to="Locator_dei_EntityDomain_6706" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6707" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6708" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6707" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6708" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6709" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue_6710" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6709" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue_6710" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6711" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss_6712" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6711" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss_6712" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6713" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss_6714" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6713" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss_6714" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6715" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets_6716" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6715" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets_6716" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6717" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets_6718" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6717" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets_6718" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6719" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets_6720" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6719" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets_6720" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6721" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities_6722" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6721" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities_6722" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6723" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities_6724" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6723" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities_6724" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6725" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity_6726" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6725" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity_6726" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6727" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity" xlink:label="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity_6728" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6727" xlink:to="Locator_us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity_6728" order="10.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6729" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6730" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6729" xlink:to="Locator_us-gaap_StatementTable_6730" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/CondensedConsolidatedStatementOfIncomeNBCUniversal">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6791" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6792" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6791" xlink:to="Locator_dei_LegalEntityAxis_6792" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6793" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6794" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6793" xlink:to="Locator_dei_EntityDomain_6794" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6795" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6796" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6795" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6796" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6797" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Revenues" xlink:label="Locator_us-gaap_Revenues_6798" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6797" xlink:to="Locator_us-gaap_Revenues_6798" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6799" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6800" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6799" xlink:to="Locator_us-gaap_CostsAndExpensesAbstract_6800" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6801" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_ProgrammingAndProductionCosts" xlink:label="Locator_cmcsa_ProgrammingAndProductionCosts_6802" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6801" xlink:to="Locator_cmcsa_ProgrammingAndProductionCosts_6802" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6803" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_OtherOperatingAndAdministrative" xlink:label="Locator_cmcsa_OtherOperatingAndAdministrative_6804" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6803" xlink:to="Locator_cmcsa_OtherOperatingAndAdministrative_6804" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6805" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_MarketingAndAdvertisingExpense" xlink:label="Locator_us-gaap_MarketingAndAdvertisingExpense_6806" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6805" xlink:to="Locator_us-gaap_MarketingAndAdvertisingExpense_6806" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6807" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_Depreciation" xlink:label="Locator_us-gaap_Depreciation_6808" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6807" xlink:to="Locator_us-gaap_Depreciation_6808" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6809" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="Locator_us-gaap_AmortizationOfIntangibleAssets_6810" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6809" xlink:to="Locator_us-gaap_AmortizationOfIntangibleAssets_6810" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="Locator_us-gaap_CostsAndExpensesAbstract_6811" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="Locator_us-gaap_CostsAndExpenses_6812" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_CostsAndExpensesAbstract_6811" xlink:to="Locator_us-gaap_CostsAndExpenses_6812" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6813" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="Locator_us-gaap_OperatingIncomeLoss_6814" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6813" xlink:to="Locator_us-gaap_OperatingIncomeLoss_6814" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6815" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6816" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6815" xlink:to="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6816" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6817" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InterestExpense" xlink:label="Locator_us-gaap_InterestExpense_6818" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6817" xlink:to="Locator_us-gaap_InterestExpense_6818" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6819" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="Locator_us-gaap_InvestmentIncomeInterest_6820" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6819" xlink:to="Locator_us-gaap_InvestmentIncomeInterest_6820" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6821" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_InvestmentIncomeNonoperating" xlink:label="Locator_us-gaap_InvestmentIncomeNonoperating_6822" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6821" xlink:to="Locator_us-gaap_InvestmentIncomeNonoperating_6822" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6823" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_6824" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6823" xlink:to="Locator_us-gaap_IncomeLossFromEquityMethodInvestments_6824" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6825" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="Locator_us-gaap_OtherNonoperatingIncomeExpense_6826" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6825" xlink:to="Locator_us-gaap_OtherNonoperatingIncomeExpense_6826" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpenseAbstract" xlink:label="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6827" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="Locator_us-gaap_NonoperatingIncomeExpense_6828" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_NonoperatingIncomeExpenseAbstract_6827" xlink:to="Locator_us-gaap_NonoperatingIncomeExpense_6828" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6829" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_6830" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6829" xlink:to="Locator_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_6830" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6831" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="Locator_us-gaap_IncomeTaxExpenseBenefit_6832" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6831" xlink:to="Locator_us-gaap_IncomeTaxExpenseBenefit_6832" order="6.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6833" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_ProfitLoss" xlink:label="Locator_us-gaap_ProfitLoss_6834" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6833" xlink:to="Locator_us-gaap_ProfitLoss_6834" order="7.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6835" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6836" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6835" xlink:to="Locator_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_6836" order="8.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6837" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="Locator_us-gaap_NetIncomeLoss_6838" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6837" xlink:to="Locator_us-gaap_NetIncomeLoss_6838" order="9.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6759" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6760" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6759" xlink:to="Locator_us-gaap_StatementTable_6760" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/SupplementalFinancialInformationComponentsOfAccumulatedOtherComprehensiveIncomeLossDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6865" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6866" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6865" xlink:to="Locator_dei_LegalEntityAxis_6866" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6867" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6868" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6867" xlink:to="Locator_dei_EntityDomain_6868" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6869" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6870" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6869" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6870" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6873" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_6874" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6873" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax_6874" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6875" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_6876" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6875" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_6876" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6877" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_6878" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6877" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_6878" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6879" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_6880" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6879" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_6880" order="4.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6881" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6882" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6881" xlink:to="Locator_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_6882" order="5.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6871" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6872" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6871" xlink:to="Locator_us-gaap_StatementTable_6872" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
    </definitionLink>
    <definitionLink xlink:type="extended" xlink:role="http://www.comcast.com/role/LongtermDebtDebtRepaymentsDetails">
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6903" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_6904" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6903" xlink:to="Locator_us-gaap_DebtInstrumentAxis_6904" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="Locator_us-gaap_DebtInstrumentAxis_6907" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6908" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_us-gaap_DebtInstrumentAxis_6907" xlink:to="Locator_us-gaap_DebtInstrumentNameDomain_6908" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6909" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NbcuniversalEnterpriseCreditFacilityMember" xlink:label="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_6910" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6909" xlink:to="Locator_cmcsa_NbcuniversalEnterpriseCreditFacilityMember_6910" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6911" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior650NotesDue2015Member" xlink:label="Locator_cmcsa_Senior650NotesDue2015Member_6912" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6911" xlink:to="Locator_cmcsa_Senior650NotesDue2015Member_6912" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="Locator_us-gaap_DebtInstrumentNameDomain_6913" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_Senior365NotesDue2015Member" xlink:label="Locator_cmcsa_Senior365NotesDue2015Member_6914" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_DebtInstrumentNameDomain_6913" xlink:to="Locator_cmcsa_Senior365NotesDue2015Member_6914" order="3.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6905" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6906" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="Locator_us-gaap_StatementTable_6905" xlink:to="Locator_dei_LegalEntityAxis_6906" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_LegalEntityAxis" xlink:label="Locator_dei_LegalEntityAxis_6915" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6916" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="Locator_dei_LegalEntityAxis_6915" xlink:to="Locator_dei_EntityDomain_6916" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityDomain" xlink:label="Locator_dei_EntityDomain_6917" />
        <loc xlink:type="locator" xlink:href="cmcsa-20150331.xsd#cmcsa_NBCUniversalMediaLLCMember" xlink:label="Locator_cmcsa_NBCUniversalMediaLLCMember_6918" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_dei_EntityDomain_6917" xlink:to="Locator_cmcsa_NBCUniversalMediaLLCMember_6918" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6901" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementTable" xlink:label="Locator_us-gaap_StatementTable_6902" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="Locator_us-gaap_StatementLineItems_6901" xlink:to="Locator_us-gaap_StatementTable_6902" order="-1.0" xbrldt:contextElement="segment" xbrldt:closed="true" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6919" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_RepaymentsOfOtherDebt" xlink:label="Locator_us-gaap_RepaymentsOfOtherDebt_6920" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6919" xlink:to="Locator_us-gaap_RepaymentsOfOtherDebt_6920" order="1.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6921" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_6922" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6921" xlink:to="Locator_us-gaap_DebtInstrumentInterestRateStatedPercentage_6922" order="2.0" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_StatementLineItems" xlink:label="Locator_us-gaap_StatementLineItems_6923" />
        <loc xlink:type="locator" xlink:href="http://xbrl.fasb.org/us-gaap/2014/elts/us-gaap-2014-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" xlink:label="Locator_us-gaap_DebtInstrumentMaturityDateDescription_6924" />
        <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="Locator_us-gaap_StatementLineItems_6923" xlink:to="Locator_us-gaap_DebtInstrumentMaturityDateDescription_6924" order="3.0" />
    </definitionLink>
</linkbase>
