<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:9c0ce64a-7f52-436c-8102-48a57d32db7d,g:9e195c1f-f6be-4833-9d4f-e0183cf1b7f0-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link: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"/>
  <link: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"/>
  <link: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"/>
  <link: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"/>
  <link:roleRef roleURI="http://www.embecta.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="simple" xlink:href="embc-20250630.xsd#CondensedConsolidatedStatementsofEquity"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/CondensedConsolidatedStatementsofEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_1e42d958-2d8a-4a50-8d35-8e70d166f157" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_790ff289-45a7-4d12-9f73-ff33125f975a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1e42d958-2d8a-4a50-8d35-8e70d166f157" xlink:to="loc_us-gaap_StatementTable_790ff289-45a7-4d12-9f73-ff33125f975a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_6d9a31ef-85a6-4692-8a53-cba628e544b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_790ff289-45a7-4d12-9f73-ff33125f975a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_6d9a31ef-85a6-4692-8a53-cba628e544b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_6d9a31ef-85a6-4692-8a53-cba628e544b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6d9a31ef-85a6-4692-8a53-cba628e544b5" xlink:to="loc_us-gaap_EquityComponentDomain_6d9a31ef-85a6-4692-8a53-cba628e544b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2e720c55-6147-469e-8781-9b317f43b354" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_6d9a31ef-85a6-4692-8a53-cba628e544b5" xlink:to="loc_us-gaap_EquityComponentDomain_2e720c55-6147-469e-8781-9b317f43b354" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_2f46750d-9274-43fe-ae30-de7aa5ede7f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2e720c55-6147-469e-8781-9b317f43b354" xlink:to="loc_us-gaap_CommonStockMember_2f46750d-9274-43fe-ae30-de7aa5ede7f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_97dcc78a-02cc-4cec-80d9-1a4655d67c09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2e720c55-6147-469e-8781-9b317f43b354" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_97dcc78a-02cc-4cec-80d9-1a4655d67c09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_4ac9063c-c29c-473f-8c39-69960dbf614e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2e720c55-6147-469e-8781-9b317f43b354" xlink:to="loc_us-gaap_RetainedEarningsMember_4ac9063c-c29c-473f-8c39-69960dbf614e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_4cf9bd67-7c8c-4449-8502-5eac22d9bdec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2e720c55-6147-469e-8781-9b317f43b354" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_4cf9bd67-7c8c-4449-8502-5eac22d9bdec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1e42d958-2d8a-4a50-8d35-8e70d166f157" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_25148934-6aa3-49bb-98dc-33a3f3b2e9c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_25148934-6aa3-49bb-98dc-33a3f3b2e9c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_dba56f3e-2c84-4f6a-a756-5a4f8c5a099c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:to="loc_us-gaap_StockholdersEquity_dba56f3e-2c84-4f6a-a756-5a4f8c5a099c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_472c8baf-c727-4e95-b485-988484758a0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:to="loc_us-gaap_NetIncomeLoss_472c8baf-c727-4e95-b485-988484758a0a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_b36d3859-e6f3-4a22-86af-11f5ae36abb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_b36d3859-e6f3-4a22-86af-11f5ae36abb0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_67044626-9a6a-4832-813c-87fbcbdb8617" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_67044626-9a6a-4832-813c-87fbcbdb8617" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_6c23d879-933c-4b16-85e1-0394d5731fa3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:to="loc_us-gaap_DividendsCommonStock_6c23d879-933c-4b16-85e1-0394d5731fa3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_d8d2f563-4328-41e0-bf1d-d80246c36d00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_d8d2f563-4328-41e0-bf1d-d80246c36d00" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_66cf5e33-9bb9-4277-a700-052ce90df781" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_ab00dc60-84a6-414e-b6d8-9aa30a5e9139" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_66cf5e33-9bb9-4277-a700-052ce90df781" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_8c5bab56-6329-4bcd-84db-170983876041" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_fb46b2fd-f93a-437c-82d8-ada92591567b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/ThirdPartyArrangementsandRelatedPartyDisclosuresDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#ThirdPartyArrangementsandRelatedPartyDisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/ThirdPartyArrangementsandRelatedPartyDisclosuresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_4a61fe0a-9fc0-48e4-996e-da9833eef80b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_e36668df-1e96-40a3-a3ae-7839edb55d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_4a61fe0a-9fc0-48e4-996e-da9833eef80b" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_e36668df-1e96-40a3-a3ae-7839edb55d8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_d611bb96-2098-4575-bd52-3d13378682da" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_e36668df-1e96-40a3-a3ae-7839edb55d8a" xlink:to="loc_srt_CounterpartyNameAxis_d611bb96-2098-4575-bd52-3d13378682da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d611bb96-2098-4575-bd52-3d13378682da_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_d611bb96-2098-4575-bd52-3d13378682da" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d611bb96-2098-4575-bd52-3d13378682da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3ad2ce2b-b44a-43c7-89cd-0460bed2c139" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_d611bb96-2098-4575-bd52-3d13378682da" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3ad2ce2b-b44a-43c7-89cd-0460bed2c139" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_BectonDickinsonAndCompanyMember_dc6f09d0-ecfc-428f-8954-4ca609cc880f" xlink:href="embc-20250630.xsd#embc_BectonDickinsonAndCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3ad2ce2b-b44a-43c7-89cd-0460bed2c139" xlink:to="loc_embc_BectonDickinsonAndCompanyMember_dc6f09d0-ecfc-428f-8954-4ca609cc880f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_57e33c05-fdf5-4dc8-aecb-dad715153e84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_e36668df-1e96-40a3-a3ae-7839edb55d8a" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_57e33c05-fdf5-4dc8-aecb-dad715153e84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_57e33c05-fdf5-4dc8-aecb-dad715153e84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_57e33c05-fdf5-4dc8-aecb-dad715153e84" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_57e33c05-fdf5-4dc8-aecb-dad715153e84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_9d6a3353-de8b-4d84-aa08-0d6f4fa38670" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_57e33c05-fdf5-4dc8-aecb-dad715153e84" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_9d6a3353-de8b-4d84-aa08-0d6f4fa38670" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_OtherReceivablesNetCurrentMember_a8befe5d-4042-4ded-bd7c-5b57397ade84" xlink:href="embc-20250630.xsd#embc_OtherReceivablesNetCurrentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d6a3353-de8b-4d84-aa08-0d6f4fa38670" xlink:to="loc_embc_OtherReceivablesNetCurrentMember_a8befe5d-4042-4ded-bd7c-5b57397ade84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeAccountsReceivableMember_55e0e2e9-e449-4043-84d5-a03e4afb18d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeAccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d6a3353-de8b-4d84-aa08-0d6f4fa38670" xlink:to="loc_us-gaap_TradeAccountsReceivableMember_55e0e2e9-e449-4043-84d5-a03e4afb18d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_AccountsPayableOtherCurrentMember_1d67fdeb-5739-4e49-b746-105f9724729e" xlink:href="embc-20250630.xsd#embc_AccountsPayableOtherCurrentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d6a3353-de8b-4d84-aa08-0d6f4fa38670" xlink:to="loc_embc_AccountsPayableOtherCurrentMember_1d67fdeb-5739-4e49-b746-105f9724729e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableMember_a2e35f59-7e84-40fd-9d66-86cc5f89a87e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_9d6a3353-de8b-4d84-aa08-0d6f4fa38670" xlink:to="loc_us-gaap_AccountsPayableMember_a2e35f59-7e84-40fd-9d66-86cc5f89a87e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_a18fe477-aef7-4614-87c0-14003882efad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_4a61fe0a-9fc0-48e4-996e-da9833eef80b" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_a18fe477-aef7-4614-87c0-14003882efad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableOtherCurrent_d23aa8bf-739b-4899-af96-7a687229f44e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableOtherCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_4a61fe0a-9fc0-48e4-996e-da9833eef80b" xlink:to="loc_us-gaap_AccountsPayableOtherCurrent_d23aa8bf-739b-4899-af96-7a687229f44e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/BusinessRestructuringChargesNarrativeDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#BusinessRestructuringChargesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/BusinessRestructuringChargesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_556a15d6-a82b-48c8-afac-dff3fd48bd94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_4ced806a-207a-4422-abed-ece5b024ae03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_556a15d6-a82b-48c8-afac-dff3fd48bd94" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_4ced806a-207a-4422-abed-ece5b024ae03" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_15d4bb8b-8262-4727-b660-c46da4f66742" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_4ced806a-207a-4422-abed-ece5b024ae03" xlink:to="loc_srt_RangeAxis_15d4bb8b-8262-4727-b660-c46da4f66742" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_15d4bb8b-8262-4727-b660-c46da4f66742_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_15d4bb8b-8262-4727-b660-c46da4f66742" xlink:to="loc_srt_RangeMember_15d4bb8b-8262-4727-b660-c46da4f66742_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f7f1efc0-2271-4b93-bae2-011334ee8bc2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_15d4bb8b-8262-4727-b660-c46da4f66742" xlink:to="loc_srt_RangeMember_f7f1efc0-2271-4b93-bae2-011334ee8bc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_aac40355-1dd5-4339-b63a-b90d183f42b5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f7f1efc0-2271-4b93-bae2-011334ee8bc2" xlink:to="loc_srt_MinimumMember_aac40355-1dd5-4339-b63a-b90d183f42b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_45439224-5495-4bd9-84da-80d895d25682" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f7f1efc0-2271-4b93-bae2-011334ee8bc2" xlink:to="loc_srt_MaximumMember_45439224-5495-4bd9-84da-80d895d25682" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_b397c72c-428b-47cc-984b-372ff33112e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_4ced806a-207a-4422-abed-ece5b024ae03" xlink:to="loc_us-gaap_RestructuringPlanAxis_b397c72c-428b-47cc-984b-372ff33112e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_b397c72c-428b-47cc-984b-372ff33112e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_b397c72c-428b-47cc-984b-372ff33112e7" xlink:to="loc_us-gaap_RestructuringPlanDomain_b397c72c-428b-47cc-984b-372ff33112e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_c2fb8218-8343-4cf7-ad54-d754520be324" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_b397c72c-428b-47cc-984b-372ff33112e7" xlink:to="loc_us-gaap_RestructuringPlanDomain_c2fb8218-8343-4cf7-ad54-d754520be324" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PatchPumpRestructuringPlanMember_b1076249-f369-41c2-bdf5-40c2481ae9de" xlink:href="embc-20250630.xsd#embc_PatchPumpRestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_c2fb8218-8343-4cf7-ad54-d754520be324" xlink:to="loc_embc_PatchPumpRestructuringPlanMember_b1076249-f369-41c2-bdf5-40c2481ae9de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A2025RestructuringPlanMember_a2cf4a79-fd4c-4c25-9038-a55558eb4eaf" xlink:href="embc-20250630.xsd#embc_A2025RestructuringPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_c2fb8218-8343-4cf7-ad54-d754520be324" xlink:to="loc_embc_A2025RestructuringPlanMember_a2cf4a79-fd4c-4c25-9038-a55558eb4eaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_b293c8b7-1ee7-444f-a8bb-de04d5bbb03f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_556a15d6-a82b-48c8-afac-dff3fd48bd94" xlink:to="loc_us-gaap_RestructuringCharges_b293c8b7-1ee7-444f-a8bb-de04d5bbb03f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/BusinessRestructuringChargesScheduleofRestructuringandRelatedCostsDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#BusinessRestructuringChargesScheduleofRestructuringandRelatedCostsDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/BusinessRestructuringChargesScheduleofRestructuringandRelatedCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_ef7e531e-46d6-47ef-b3f9-402b98b7aa10" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_20913490-ddf7-4f1b-b12d-3bf8f2095b58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_ef7e531e-46d6-47ef-b3f9-402b98b7aa10" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_20913490-ddf7-4f1b-b12d-3bf8f2095b58" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_0c1908dd-3b7c-4bda-967b-1e4934ca8a4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_20913490-ddf7-4f1b-b12d-3bf8f2095b58" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_0c1908dd-3b7c-4bda-967b-1e4934ca8a4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_0c1908dd-3b7c-4bda-967b-1e4934ca8a4a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_0c1908dd-3b7c-4bda-967b-1e4934ca8a4a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_0c1908dd-3b7c-4bda-967b-1e4934ca8a4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_6d9ee374-0877-4187-9b8f-dd6a74e0fceb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_0c1908dd-3b7c-4bda-967b-1e4934ca8a4a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_6d9ee374-0877-4187-9b8f-dd6a74e0fceb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_d7c89508-1c85-4333-806e-f1f2514d7785" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_6d9ee374-0877-4187-9b8f-dd6a74e0fceb" xlink:to="loc_us-gaap_CostOfSalesMember_d7c89508-1c85-4333-806e-f1f2514d7785" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_45c4b6ff-9d25-4ab8-9311-68aae93f9a15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_6d9ee374-0877-4187-9b8f-dd6a74e0fceb" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_45c4b6ff-9d25-4ab8-9311-68aae93f9a15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_c37299af-f2cd-4b3c-8e7c-43cb0cf79aee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_6d9ee374-0877-4187-9b8f-dd6a74e0fceb" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_c37299af-f2cd-4b3c-8e7c-43cb0cf79aee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseMember_a423895b-c6a3-4df4-8346-d41f37e3591f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_6d9ee374-0877-4187-9b8f-dd6a74e0fceb" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseMember_a423895b-c6a3-4df4-8346-d41f37e3591f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_501a53d9-b8c0-4067-9462-08615e5d7412" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_20913490-ddf7-4f1b-b12d-3bf8f2095b58" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_501a53d9-b8c0-4067-9462-08615e5d7412" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_501a53d9-b8c0-4067-9462-08615e5d7412_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_501a53d9-b8c0-4067-9462-08615e5d7412" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_501a53d9-b8c0-4067-9462-08615e5d7412_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_7462a8fc-c926-4d41-976f-6afc8f5b6893" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_501a53d9-b8c0-4067-9462-08615e5d7412" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_7462a8fc-c926-4d41-976f-6afc8f5b6893" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_ec230f53-1d76-438c-9d25-6d67f40fea6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_7462a8fc-c926-4d41-976f-6afc8f5b6893" xlink:to="loc_us-gaap_EmployeeSeveranceMember_ec230f53-1d76-438c-9d25-6d67f40fea6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_cb33c893-e356-4da7-861c-35e067a68903" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_7462a8fc-c926-4d41-976f-6afc8f5b6893" xlink:to="loc_us-gaap_OtherRestructuringMember_cb33c893-e356-4da7-861c-35e067a68903" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_c3bf6ed7-c18b-45f9-bbf6-88068e81386b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_ef7e531e-46d6-47ef-b3f9-402b98b7aa10" xlink:to="loc_us-gaap_RestructuringCharges_c3bf6ed7-c18b-45f9-bbf6-88068e81386b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/BusinessRestructuringChargesScheduleofRestructuringLiabilityActivityDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#BusinessRestructuringChargesScheduleofRestructuringLiabilityActivityDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/BusinessRestructuringChargesScheduleofRestructuringLiabilityActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_8c7bf866-9d46-4051-9f74-9a8606666a73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5edb119d-87f0-4710-a5d6-53831a97fcdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_8c7bf866-9d46-4051-9f74-9a8606666a73" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5edb119d-87f0-4710-a5d6-53831a97fcdd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_dc8a0055-7226-4e9b-96d3-357a1932aaf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5edb119d-87f0-4710-a5d6-53831a97fcdd" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_dc8a0055-7226-4e9b-96d3-357a1932aaf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_dc8a0055-7226-4e9b-96d3-357a1932aaf9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_dc8a0055-7226-4e9b-96d3-357a1932aaf9" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_dc8a0055-7226-4e9b-96d3-357a1932aaf9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_a86f4f36-f209-480f-95fa-0e98e49e02eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_dc8a0055-7226-4e9b-96d3-357a1932aaf9" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_a86f4f36-f209-480f-95fa-0e98e49e02eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeSeveranceMember_700c3a07-ca6e-494c-b057-47ef26bb0117" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeSeveranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_a86f4f36-f209-480f-95fa-0e98e49e02eb" xlink:to="loc_us-gaap_EmployeeSeveranceMember_700c3a07-ca6e-494c-b057-47ef26bb0117" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringMember_97b92322-a581-427f-90dc-5a535824b46f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRestructuringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_a86f4f36-f209-480f-95fa-0e98e49e02eb" xlink:to="loc_us-gaap_OtherRestructuringMember_97b92322-a581-427f-90dc-5a535824b46f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_2edab156-f994-4f0e-b772-123c1718533f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5edb119d-87f0-4710-a5d6-53831a97fcdd" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_2edab156-f994-4f0e-b772-123c1718533f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_2edab156-f994-4f0e-b772-123c1718533f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_2edab156-f994-4f0e-b772-123c1718533f" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_2edab156-f994-4f0e-b772-123c1718533f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_abf6d1a7-7737-41d6-841f-13223f7a39f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_2edab156-f994-4f0e-b772-123c1718533f" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_abf6d1a7-7737-41d6-841f-13223f7a39f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SalariesWagesAndRelatedItemsMember_921c4f71-82cb-477e-96af-c4986a6a558a" xlink:href="embc-20250630.xsd#embc_SalariesWagesAndRelatedItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_abf6d1a7-7737-41d6-841f-13223f7a39f1" xlink:to="loc_embc_SalariesWagesAndRelatedItemsMember_921c4f71-82cb-477e-96af-c4986a6a558a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesMember_80660e1a-9f74-4ee0-8b99-0f483baf7b75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_abf6d1a7-7737-41d6-841f-13223f7a39f1" xlink:to="loc_us-gaap_AccruedLiabilitiesMember_80660e1a-9f74-4ee0-8b99-0f483baf7b75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_366e7d80-c604-421c-a9b3-bf6632fc7992" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_8c7bf866-9d46-4051-9f74-9a8606666a73" xlink:to="loc_us-gaap_RestructuringReserveRollForward_366e7d80-c604-421c-a9b3-bf6632fc7992" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_60b14fc4-3197-4585-ace9-2239c4904564" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_366e7d80-c604-421c-a9b3-bf6632fc7992" xlink:to="loc_us-gaap_RestructuringReserve_60b14fc4-3197-4585-ace9-2239c4904564" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_b192a529-5d4a-44e1-9961-4840f7c9e540" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_366e7d80-c604-421c-a9b3-bf6632fc7992" xlink:to="loc_us-gaap_RestructuringCharges_b192a529-5d4a-44e1-9961-4840f7c9e540" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_a3a93b83-1ed3-41b2-9896-b8b18b9c6f9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_366e7d80-c604-421c-a9b3-bf6632fc7992" xlink:to="loc_us-gaap_PaymentsForRestructuring_a3a93b83-1ed3-41b2-9896-b8b18b9c6f9a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_03f4f5a1-bbd0-42f7-931d-79f631c78d69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserveAccrualAdjustment1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_366e7d80-c604-421c-a9b3-bf6632fc7992" xlink:to="loc_us-gaap_RestructuringReserveAccrualAdjustment1_03f4f5a1-bbd0-42f7-931d-79f631c78d69" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_096248f7-9461-4587-8281-3850cb28b04f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringReserve"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/SegmentandGeographicalDataScheduleofRevenuesbyGeographicalRegionDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#SegmentandGeographicalDataScheduleofRevenuesbyGeographicalRegionDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/SegmentandGeographicalDataScheduleofRevenuesbyGeographicalRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_d8790876-c54c-48e7-9c6a-03f63a7c58d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_b4ae3537-b708-43d8-b703-0351cb19c77d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d8790876-c54c-48e7-9c6a-03f63a7c58d4" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_b4ae3537-b708-43d8-b703-0351cb19c77d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_40cd7c9b-6796-4d4a-9409-96d360edf800" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_b4ae3537-b708-43d8-b703-0351cb19c77d" xlink:to="loc_srt_StatementGeographicalAxis_40cd7c9b-6796-4d4a-9409-96d360edf800" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_40cd7c9b-6796-4d4a-9409-96d360edf800_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_40cd7c9b-6796-4d4a-9409-96d360edf800" xlink:to="loc_srt_SegmentGeographicalDomain_40cd7c9b-6796-4d4a-9409-96d360edf800_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_f18994aa-29a6-4bf0-81f0-8242874c07c9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_40cd7c9b-6796-4d4a-9409-96d360edf800" xlink:to="loc_srt_SegmentGeographicalDomain_f18994aa-29a6-4bf0-81f0-8242874c07c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_b851522a-2277-4d5e-9cf6-6b7dbf5fc75a" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_f18994aa-29a6-4bf0-81f0-8242874c07c9" xlink:to="loc_country_US_b851522a-2277-4d5e-9cf6-6b7dbf5fc75a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_8f267773-9967-4d75-82c4-a3375ada9a95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_f18994aa-29a6-4bf0-81f0-8242874c07c9" xlink:to="loc_us-gaap_NonUsMember_8f267773-9967-4d75-82c4-a3375ada9a95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a8376960-e68b-4a80-8cfb-dbab243f8b3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_d8790876-c54c-48e7-9c6a-03f63a7c58d4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a8376960-e68b-4a80-8cfb-dbab243f8b3d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/SegmentGeographicalDataScheduleofRevenuesbyProductFamilyDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#SegmentGeographicalDataScheduleofRevenuesbyProductFamilyDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/SegmentGeographicalDataScheduleofRevenuesbyProductFamilyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_021f82c4-b022-4597-a62a-a866f0d8da8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d5839cfc-757d-4bab-9a6a-549657dd6c39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_021f82c4-b022-4597-a62a-a866f0d8da8e" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d5839cfc-757d-4bab-9a6a-549657dd6c39" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_84d0aca2-d0f9-49b8-b683-d6116f50aa08" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d5839cfc-757d-4bab-9a6a-549657dd6c39" xlink:to="loc_srt_ProductOrServiceAxis_84d0aca2-d0f9-49b8-b683-d6116f50aa08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_84d0aca2-d0f9-49b8-b683-d6116f50aa08_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_84d0aca2-d0f9-49b8-b683-d6116f50aa08" xlink:to="loc_srt_ProductsAndServicesDomain_84d0aca2-d0f9-49b8-b683-d6116f50aa08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_cf833c1e-223c-4536-88c3-4f57b350db6f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_84d0aca2-d0f9-49b8-b683-d6116f50aa08" xlink:to="loc_srt_ProductsAndServicesDomain_cf833c1e-223c-4536-88c3-4f57b350db6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PenNeedlesMember_48e2d0a8-6a0a-4611-bac6-3d8475217de8" xlink:href="embc-20250630.xsd#embc_PenNeedlesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_cf833c1e-223c-4536-88c3-4f57b350db6f" xlink:to="loc_embc_PenNeedlesMember_48e2d0a8-6a0a-4611-bac6-3d8475217de8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SyringesMember_e419e2a3-2529-4ccc-a1bd-ffe871ed7d9f" xlink:href="embc-20250630.xsd#embc_SyringesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_cf833c1e-223c-4536-88c3-4f57b350db6f" xlink:to="loc_embc_SyringesMember_e419e2a3-2529-4ccc-a1bd-ffe871ed7d9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SafetyMember_a3986afe-8caf-4c8f-8ceb-f1b7b08003eb" xlink:href="embc-20250630.xsd#embc_SafetyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_cf833c1e-223c-4536-88c3-4f57b350db6f" xlink:to="loc_embc_SafetyMember_a3986afe-8caf-4c8f-8ceb-f1b7b08003eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductAndServiceOtherMember_4c061c69-4e2b-4ee6-8bdc-b7427cd7a67d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductAndServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_cf833c1e-223c-4536-88c3-4f57b350db6f" xlink:to="loc_us-gaap_ProductAndServiceOtherMember_4c061c69-4e2b-4ee6-8bdc-b7427cd7a67d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ManufacturingFacilityMember_063764dc-d11b-4b75-a817-e876ef17b9f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ManufacturingFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_cf833c1e-223c-4536-88c3-4f57b350db6f" xlink:to="loc_us-gaap_ManufacturingFacilityMember_063764dc-d11b-4b75-a817-e876ef17b9f1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_42a631c8-a3ef-4c10-b055-dbd124638454" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_021f82c4-b022-4597-a62a-a866f0d8da8e" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_42a631c8-a3ef-4c10-b055-dbd124638454" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/StockBasedCompensationStockbasedCompensationExpenseDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#StockBasedCompensationStockbasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/StockBasedCompensationStockbasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_b9408767-3991-455f-935c-df6b1c6bba49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_15b3ff42-7ae3-4dc0-9088-b3936833c5d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_b9408767-3991-455f-935c-df6b1c6bba49" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_15b3ff42-7ae3-4dc0-9088-b3936833c5d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_6a29d16d-c1a0-4c75-ad30-aba4e813e46a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_15b3ff42-7ae3-4dc0-9088-b3936833c5d1" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_6a29d16d-c1a0-4c75-ad30-aba4e813e46a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_6a29d16d-c1a0-4c75-ad30-aba4e813e46a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_6a29d16d-c1a0-4c75-ad30-aba4e813e46a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_6a29d16d-c1a0-4c75-ad30-aba4e813e46a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_697fbada-7465-42ca-b6ea-26eee58dd2de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_6a29d16d-c1a0-4c75-ad30-aba4e813e46a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_697fbada-7465-42ca-b6ea-26eee58dd2de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_461b738d-fcc8-4619-b54b-c4d0fafa92c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_697fbada-7465-42ca-b6ea-26eee58dd2de" xlink:to="loc_us-gaap_CostOfSalesMember_461b738d-fcc8-4619-b54b-c4d0fafa92c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_6e09f3f4-72ca-4da7-b2bb-f3860346811a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_697fbada-7465-42ca-b6ea-26eee58dd2de" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_6e09f3f4-72ca-4da7-b2bb-f3860346811a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_8fe7247f-b1d1-4904-bbfa-6167827e0635" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_697fbada-7465-42ca-b6ea-26eee58dd2de" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_8fe7247f-b1d1-4904-bbfa-6167827e0635" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseMember_bd777014-3ab5-4e2a-a8d0-9a4c526d67cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_697fbada-7465-42ca-b6ea-26eee58dd2de" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseMember_bd777014-3ab5-4e2a-a8d0-9a4c526d67cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_a6b5e554-6ae7-46f3-84d1-b9738d2d94af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_15b3ff42-7ae3-4dc0-9088-b3936833c5d1" xlink:to="loc_us-gaap_AwardTypeAxis_a6b5e554-6ae7-46f3-84d1-b9738d2d94af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a6b5e554-6ae7-46f3-84d1-b9738d2d94af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_a6b5e554-6ae7-46f3-84d1-b9738d2d94af" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a6b5e554-6ae7-46f3-84d1-b9738d2d94af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6660ef81-df84-49b6-a9f6-d9e658ded843" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_a6b5e554-6ae7-46f3-84d1-b9738d2d94af" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6660ef81-df84-49b6-a9f6-d9e658ded843" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_805d376d-91a7-4510-9a9d-6163696cd791" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6660ef81-df84-49b6-a9f6-d9e658ded843" xlink:to="loc_us-gaap_StockCompensationPlanMember_805d376d-91a7-4510-9a9d-6163696cd791" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedPaymentArrangementLiabilityAwardMember_a0c142e8-9408-4074-9524-46a0f058dd11" xlink:href="embc-20250630.xsd#embc_ShareBasedPaymentArrangementLiabilityAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6660ef81-df84-49b6-a9f6-d9e658ded843" xlink:to="loc_embc_ShareBasedPaymentArrangementLiabilityAwardMember_a0c142e8-9408-4074-9524-46a0f058dd11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_TimeVestedRestrictedStockUnitsMember_e969bc45-9d4f-4fd0-b9fe-acb938bb4640" xlink:href="embc-20250630.xsd#embc_TimeVestedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6660ef81-df84-49b6-a9f6-d9e658ded843" xlink:to="loc_embc_TimeVestedRestrictedStockUnitsMember_e969bc45-9d4f-4fd0-b9fe-acb938bb4640" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PerformanceBasedRestrictedStockUnitsMember_821efaf0-1799-4d72-ad44-0c912965e3b8" xlink:href="embc-20250630.xsd#embc_PerformanceBasedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6660ef81-df84-49b6-a9f6-d9e658ded843" xlink:to="loc_embc_PerformanceBasedRestrictedStockUnitsMember_821efaf0-1799-4d72-ad44-0c912965e3b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_b7623cc9-5edb-4a4d-9679-9dc543b10a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_6660ef81-df84-49b6-a9f6-d9e658ded843" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_b7623cc9-5edb-4a4d-9679-9dc543b10a8c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_7fed7642-3244-484e-b24f-35ece52b8b18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_b9408767-3991-455f-935c-df6b1c6bba49" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_7fed7642-3244-484e-b24f-35ece52b8b18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_4eb29536-d0b2-435b-8780-c3c8b6b2f73c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_b9408767-3991-455f-935c-df6b1c6bba49" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_4eb29536-d0b2-435b-8780-c3c8b6b2f73c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#StockBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/StockBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d799ecd3-a04b-43f7-a540-65d89f6e881a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d799ecd3-a04b-43f7-a540-65d89f6e881a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_7f95baa2-50eb-458d-8185-9e5887b8efc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d799ecd3-a04b-43f7-a540-65d89f6e881a" xlink:to="loc_us-gaap_AwardTypeAxis_7f95baa2-50eb-458d-8185-9e5887b8efc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f95baa2-50eb-458d-8185-9e5887b8efc4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7f95baa2-50eb-458d-8185-9e5887b8efc4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7f95baa2-50eb-458d-8185-9e5887b8efc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9c468872-9f18-4c64-8e97-89de368cc025" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7f95baa2-50eb-458d-8185-9e5887b8efc4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9c468872-9f18-4c64-8e97-89de368cc025" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_TimeVestedRestrictedStockUnitsMember_10ea9237-7ded-4c51-af93-756cc4991334" xlink:href="embc-20250630.xsd#embc_TimeVestedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9c468872-9f18-4c64-8e97-89de368cc025" xlink:to="loc_embc_TimeVestedRestrictedStockUnitsMember_10ea9237-7ded-4c51-af93-756cc4991334" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PerformanceStockUnitsPSUsMember_eb13d607-6d49-42bc-80fa-5d7c3ea535ea" xlink:href="embc-20250630.xsd#embc_PerformanceStockUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9c468872-9f18-4c64-8e97-89de368cc025" xlink:to="loc_embc_PerformanceStockUnitsPSUsMember_eb13d607-6d49-42bc-80fa-5d7c3ea535ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_e239824c-f8d5-4cff-a203-b825d0649a17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9c468872-9f18-4c64-8e97-89de368cc025" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_e239824c-f8d5-4cff-a203-b825d0649a17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_1ba0295a-bb4d-4646-ba2f-e54cbf902611" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d799ecd3-a04b-43f7-a540-65d89f6e881a" xlink:to="loc_srt_TitleOfIndividualAxis_1ba0295a-bb4d-4646-ba2f-e54cbf902611" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_1ba0295a-bb4d-4646-ba2f-e54cbf902611_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_1ba0295a-bb4d-4646-ba2f-e54cbf902611" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_1ba0295a-bb4d-4646-ba2f-e54cbf902611_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_89993262-dd8f-4343-9ba9-a78b38ffb1e0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_1ba0295a-bb4d-4646-ba2f-e54cbf902611" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_89993262-dd8f-4343-9ba9-a78b38ffb1e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ExecutiveOfficersAndEmployeesMember_87f32618-68fe-443b-abec-525b80496ca5" xlink:href="embc-20250630.xsd#embc_ExecutiveOfficersAndEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_89993262-dd8f-4343-9ba9-a78b38ffb1e0" xlink:to="loc_embc_ExecutiveOfficersAndEmployeesMember_87f32618-68fe-443b-abec-525b80496ca5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_913ae0d6-6f83-40c5-88ff-e84c4411049e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_d799ecd3-a04b-43f7-a540-65d89f6e881a" xlink:to="loc_us-gaap_PlanNameAxis_913ae0d6-6f83-40c5-88ff-e84c4411049e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_913ae0d6-6f83-40c5-88ff-e84c4411049e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_913ae0d6-6f83-40c5-88ff-e84c4411049e" xlink:to="loc_us-gaap_PlanNameDomain_913ae0d6-6f83-40c5-88ff-e84c4411049e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b7afe1e3-f94e-4015-bfbc-496d566e9302" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_913ae0d6-6f83-40c5-88ff-e84c4411049e" xlink:to="loc_us-gaap_PlanNameDomain_b7afe1e3-f94e-4015-bfbc-496d566e9302" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A2022EmployeeAndDirectorEquityBasedCompensationPlanMember_85589f40-9988-42fa-881a-38127e12c4ad" xlink:href="embc-20250630.xsd#embc_A2022EmployeeAndDirectorEquityBasedCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b7afe1e3-f94e-4015-bfbc-496d566e9302" xlink:to="loc_embc_A2022EmployeeAndDirectorEquityBasedCompensationPlanMember_85589f40-9988-42fa-881a-38127e12c4ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_e4ba5219-a52e-47bc-b872-f03bfc6f7bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_e4ba5219-a52e-47bc-b872-f03bfc6f7bf9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_59f5681f-f917-4a4c-82ad-52eafa762a22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_59f5681f-f917-4a4c-82ad-52eafa762a22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_15ea764e-02fe-4a64-9351-ba9ff31269bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_15ea764e-02fe-4a64-9351-ba9ff31269bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_60cb34fe-0f59-43cd-ad99-4bb6ece3b160" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_60cb34fe-0f59-43cd-ad99-4bb6ece3b160" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_514cdba8-6773-4ed2-a1d2-1d3e3c143718" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_514cdba8-6773-4ed2-a1d2-1d3e3c143718" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodExcludingAccumulatedNonvestedDividendEquivalents_026b4e19-531f-40f1-b680-3ae966fe9eac" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodExcludingAccumulatedNonvestedDividendEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodExcludingAccumulatedNonvestedDividendEquivalents_026b4e19-531f-40f1-b680-3ae966fe9eac" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_af879c85-e643-4658-ab8c-77e37c350b8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_af879c85-e643-4658-ab8c-77e37c350b8b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7a9b55ae-d170-4e0d-a79c-f1633df6e631" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_7a9b55ae-d170-4e0d-a79c-f1633df6e631" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_8149faa4-9dcb-4c6f-807e-bfd2cafe910a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_bcbf062b-0329-4b32-941c-6e52de69d799" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_8149faa4-9dcb-4c6f-807e-bfd2cafe910a" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/StockBasedCompensationRestrictedStockUnitsActivityDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#StockBasedCompensationRestrictedStockUnitsActivityDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/StockBasedCompensationRestrictedStockUnitsActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d38010e9-7fc8-47c6-978b-ae4b034fcc50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b300a274-90db-4673-bfe9-1f282f1f69df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d38010e9-7fc8-47c6-978b-ae4b034fcc50" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b300a274-90db-4673-bfe9-1f282f1f69df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_72e1782a-522a-4734-a8c4-f464c0bf3658" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b300a274-90db-4673-bfe9-1f282f1f69df" xlink:to="loc_us-gaap_AwardTypeAxis_72e1782a-522a-4734-a8c4-f464c0bf3658" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_72e1782a-522a-4734-a8c4-f464c0bf3658_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_72e1782a-522a-4734-a8c4-f464c0bf3658" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_72e1782a-522a-4734-a8c4-f464c0bf3658_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_251d775f-5601-4569-a1b9-90bc18c31cc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_72e1782a-522a-4734-a8c4-f464c0bf3658" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_251d775f-5601-4569-a1b9-90bc18c31cc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_TimeVestedRestrictedStockUnitsMember_7f20d5a7-5943-4805-86bc-873e6dab8196" xlink:href="embc-20250630.xsd#embc_TimeVestedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_251d775f-5601-4569-a1b9-90bc18c31cc7" xlink:to="loc_embc_TimeVestedRestrictedStockUnitsMember_7f20d5a7-5943-4805-86bc-873e6dab8196" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_PerformanceStockUnitsPSUsMember_ef755a04-c680-4af7-b515-dda96c704109" xlink:href="embc-20250630.xsd#embc_PerformanceStockUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_251d775f-5601-4569-a1b9-90bc18c31cc7" xlink:to="loc_embc_PerformanceStockUnitsPSUsMember_ef755a04-c680-4af7-b515-dda96c704109" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_93dbc672-181c-4114-be5b-780873608abe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d38010e9-7fc8-47c6-978b-ae4b034fcc50" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_93dbc672-181c-4114-be5b-780873608abe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_7e47901d-2626-4167-9618-a81937eb5f86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_93dbc672-181c-4114-be5b-780873608abe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_7e47901d-2626-4167-9618-a81937eb5f86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2d085fed-8e9b-4649-b2ce-8e11db8b83cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_93dbc672-181c-4114-be5b-780873608abe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2d085fed-8e9b-4649-b2ce-8e11db8b83cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6a726487-1e19-4068-aa5f-155eee1bb59d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_93dbc672-181c-4114-be5b-780873608abe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_6a726487-1e19-4068-aa5f-155eee1bb59d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_1c1dee95-b4a2-480e-9e0f-09bd30dc280d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_93dbc672-181c-4114-be5b-780873608abe" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_1c1dee95-b4a2-480e-9e0f-09bd30dc280d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_7e586964-0eb7-4cc5-afb0-77bd9e7a3aa3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestOutstandingNumber_f8689735-ca18-4282-8f21-0b802915104f" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d38010e9-7fc8-47c6-978b-ae4b034fcc50" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestOutstandingNumber_f8689735-ca18-4282-8f21-0b802915104f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_16ab60f7-c209-4f8c-bb00-202f393290f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d38010e9-7fc8-47c6-978b-ae4b034fcc50" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_16ab60f7-c209-4f8c-bb00-202f393290f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_88a41d58-f5da-4611-8839-09a3aa567d49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_16ab60f7-c209-4f8c-bb00-202f393290f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_88a41d58-f5da-4611-8839-09a3aa567d49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5ac2e63e-3916-414c-975b-254c00bab789" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_16ab60f7-c209-4f8c-bb00-202f393290f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_5ac2e63e-3916-414c-975b-254c00bab789" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_a45a28e3-e76e-45e6-a7ab-8e131f11b6e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_16ab60f7-c209-4f8c-bb00-202f393290f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_a45a28e3-e76e-45e6-a7ab-8e131f11b6e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_a013a4f6-ae9b-4f56-820f-0901f055cb93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_16ab60f7-c209-4f8c-bb00-202f393290f2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_a013a4f6-ae9b-4f56-820f-0901f055cb93" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_e5032b39-a68b-4abe-83c0-e3e1543e6d2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_c06bac78-643d-4fb8-9ac6-6faacccffc2e" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d38010e9-7fc8-47c6-978b-ae4b034fcc50" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_c06bac78-643d-4fb8-9ac6-6faacccffc2e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/StockBasedCompensationSARsOutstandingandtheChangesDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#StockBasedCompensationSARsOutstandingandtheChangesDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/StockBasedCompensationSARsOutstandingandtheChangesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_73207de0-1e75-41cf-90e1-a2af166f338b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_73207de0-1e75-41cf-90e1-a2af166f338b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_52c66681-9787-4e51-bc1a-2fb4c0120be9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_73207de0-1e75-41cf-90e1-a2af166f338b" xlink:to="loc_us-gaap_AwardTypeAxis_52c66681-9787-4e51-bc1a-2fb4c0120be9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_52c66681-9787-4e51-bc1a-2fb4c0120be9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_52c66681-9787-4e51-bc1a-2fb4c0120be9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_52c66681-9787-4e51-bc1a-2fb4c0120be9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4963c85d-e89f-49cf-9f5e-13bcd3233591" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_52c66681-9787-4e51-bc1a-2fb4c0120be9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4963c85d-e89f-49cf-9f5e-13bcd3233591" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_50e72386-542a-4544-9cac-5608d7050a7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4963c85d-e89f-49cf-9f5e-13bcd3233591" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_50e72386-542a-4544-9cac-5608d7050a7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_c1e757fc-ad1f-40d0-bb5d-b4940dd1d381" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_c1e757fc-ad1f-40d0-bb5d-b4940dd1d381" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_d07d4625-357e-47dd-bc86-255edd708848" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_c1e757fc-ad1f-40d0-bb5d-b4940dd1d381" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_d07d4625-357e-47dd-bc86-255edd708848" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_bd5207cf-f528-486f-acb9-faec92b0d42c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_c1e757fc-ad1f-40d0-bb5d-b4940dd1d381" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_bd5207cf-f528-486f-acb9-faec92b0d42c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations_0a0a0ed6-8904-42f1-94ae-2cf36840374d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_c1e757fc-ad1f-40d0-bb5d-b4940dd1d381" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations_0a0a0ed6-8904-42f1-94ae-2cf36840374d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_7b25e571-d38e-480a-9365-5f7b3dabaff4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingNumber_d04cf430-b33b-473d-9228-41edac2f72f5" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingNumber_d04cf430-b33b-473d-9228-41edac2f72f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber_54d09d9f-df6c-4982-b968-ad70bfdf2be6" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber_54d09d9f-df6c-4982-b968-ad70bfdf2be6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_63ab1308-d096-410e-a847-15abe1e26003" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_63ab1308-d096-410e-a847-15abe1e26003" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_43d979bf-7f55-4adc-be07-352b3eb1c51b" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_63ab1308-d096-410e-a847-15abe1e26003" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_43d979bf-7f55-4adc-be07-352b3eb1c51b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesInPeriodWeightedAverageExercisePrice_139389b7-b5c3-43de-8180-31ac1a2661eb" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_63ab1308-d096-410e-a847-15abe1e26003" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesInPeriodWeightedAverageExercisePrice_139389b7-b5c3-43de-8180-31ac1a2661eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_d543d623-d33f-4b03-9541-2d60992afede" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWeightedAverageExercisePriceRollForward_63ab1308-d096-410e-a847-15abe1e26003" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_d543d623-d33f-4b03-9541-2d60992afede" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice_0cb65796-59a0-406f-84b4-de465bda93de" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_e2829f6d-1840-45c6-9f0f-faf8f5251bed" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_e2829f6d-1840-45c6-9f0f-faf8f5251bed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice_c14d1699-6cec-497b-910b-ed9c88c9af04" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice_c14d1699-6cec-497b-910b-ed9c88c9af04" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_3b7467c6-91dd-4cd1-8e00-892f2f414e40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_5f0dc208-3784-4074-babb-13794c1804b9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_3b7467c6-91dd-4cd1-8e00-892f2f414e40" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_d1e10103-4907-493f-97ad-0938bca8ef48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_3b7467c6-91dd-4cd1-8e00-892f2f414e40" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms_d1e10103-4907-493f-97ad-0938bca8ef48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm_b3eae01d-fbf5-4c60-9900-91d1e02be5e2" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_3b7467c6-91dd-4cd1-8e00-892f2f414e40" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm_b3eae01d-fbf5-4c60-9900-91d1e02be5e2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageRemainingContractualTerm_725273fa-4c74-48fa-b714-c8fec5fbfa2b" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageRemainingContractualTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_3b7467c6-91dd-4cd1-8e00-892f2f414e40" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageRemainingContractualTerm_725273fa-4c74-48fa-b714-c8fec5fbfa2b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_ff897a23-ce70-4738-8125-9391ed457ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_3b7467c6-91dd-4cd1-8e00-892f2f414e40" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_ff897a23-ce70-4738-8125-9391ed457ec8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_9c672ce5-4559-413a-bb24-e2b77ea97550" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_3b7467c6-91dd-4cd1-8e00-892f2f414e40" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_9c672ce5-4559-413a-bb24-e2b77ea97550" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAggregateIntrinsicValue_2ec3f639-2984-4464-ab32-a616a1f2c774" xlink:href="embc-20250630.xsd#embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_3b7467c6-91dd-4cd1-8e00-892f2f414e40" xlink:to="loc_embc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableAggregateIntrinsicValue_2ec3f639-2984-4464-ab32-a616a1f2c774" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/GoodwillandOtherIntangibleAssetsScheduleofGoodwillandOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#GoodwillandOtherIntangibleAssetsScheduleofGoodwillandOtherIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/GoodwillandOtherIntangibleAssetsScheduleofGoodwillandOtherIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_f19d7eec-09ee-4573-8fd1-b88bf0a7a77e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2d3b7966-8105-4c28-9ecf-c0c2ec277aaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_f19d7eec-09ee-4573-8fd1-b88bf0a7a77e" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2d3b7966-8105-4c28-9ecf-c0c2ec277aaa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_bcae6dce-aa43-45fd-8ceb-a5ced641de5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_2d3b7966-8105-4c28-9ecf-c0c2ec277aaa" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_bcae6dce-aa43-45fd-8ceb-a5ced641de5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_bcae6dce-aa43-45fd-8ceb-a5ced641de5d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_bcae6dce-aa43-45fd-8ceb-a5ced641de5d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_bcae6dce-aa43-45fd-8ceb-a5ced641de5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7b59d656-079c-4a69-b332-9d0e85402d68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_bcae6dce-aa43-45fd-8ceb-a5ced641de5d" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7b59d656-079c-4a69-b332-9d0e85402d68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_2f7af6e8-b325-40c2-8147-77ba95af89c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7b59d656-079c-4a69-b332-9d0e85402d68" xlink:to="loc_us-gaap_PatentsMember_2f7af6e8-b325-40c2-8147-77ba95af89c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_CustomerRelationshipAndOtherMember_e0513402-16e8-4b9a-b61b-e01bc50f5baf" xlink:href="embc-20250630.xsd#embc_CustomerRelationshipAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7b59d656-079c-4a69-b332-9d0e85402d68" xlink:to="loc_embc_CustomerRelationshipAndOtherMember_e0513402-16e8-4b9a-b61b-e01bc50f5baf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0b508a48-aaae-4feb-8156-c524456d91b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_f19d7eec-09ee-4573-8fd1-b88bf0a7a77e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_0b508a48-aaae-4feb-8156-c524456d91b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bb9afd95-da2b-4676-9a55-f5a5ac675e1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_f19d7eec-09ee-4573-8fd1-b88bf0a7a77e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bb9afd95-da2b-4676-9a55-f5a5ac675e1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_664bb7eb-d0e7-4264-a8cb-31f95c96e3ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_f19d7eec-09ee-4573-8fd1-b88bf0a7a77e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_664bb7eb-d0e7-4264-a8cb-31f95c96e3ec" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/CloudComputingArrangementsAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#CloudComputingArrangementsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/CloudComputingArrangementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_d84d9419-3178-49f7-b299-64ab0f4b35ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_06410d8a-f929-438c-8581-9fd99978e12b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_d84d9419-3178-49f7-b299-64ab0f4b35ef" xlink:to="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_06410d8a-f929-438c-8581-9fd99978e12b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_40c5b547-5b5c-40dc-bae6-c36ccebe6280" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_06410d8a-f929-438c-8581-9fd99978e12b" xlink:to="loc_srt_RangeAxis_40c5b547-5b5c-40dc-bae6-c36ccebe6280" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_40c5b547-5b5c-40dc-bae6-c36ccebe6280_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_40c5b547-5b5c-40dc-bae6-c36ccebe6280" xlink:to="loc_srt_RangeMember_40c5b547-5b5c-40dc-bae6-c36ccebe6280_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_194c2367-8445-46da-a8e2-f02beddcbfef" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_40c5b547-5b5c-40dc-bae6-c36ccebe6280" xlink:to="loc_srt_RangeMember_194c2367-8445-46da-a8e2-f02beddcbfef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_cb86ffb2-c391-40dd-a990-cb19033294bf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_194c2367-8445-46da-a8e2-f02beddcbfef" xlink:to="loc_srt_MinimumMember_cb86ffb2-c391-40dd-a990-cb19033294bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_bc11ae7c-6341-47e5-a08c-8a98b525c961" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_194c2367-8445-46da-a8e2-f02beddcbfef" xlink:to="loc_srt_MaximumMember_bc11ae7c-6341-47e5-a08c-8a98b525c961" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_HostingArrangementServiceContractAssetsInServiceUsefulLife_183ecffa-e365-4f75-9b8f-b7bfdf74c9d1" xlink:href="embc-20250630.xsd#embc_HostingArrangementServiceContractAssetsInServiceUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems_d84d9419-3178-49f7-b299-64ab0f4b35ef" xlink:to="loc_embc_HostingArrangementServiceContractAssetsInServiceUsefulLife_183ecffa-e365-4f75-9b8f-b7bfdf74c9d1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/LongTermDebtAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#LongTermDebtAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/LongTermDebtAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_4105e5ca-3b5c-4608-b981-bbea85382c31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_DebtInstrumentTable_4105e5ca-3b5c-4608-b981-bbea85382c31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_47f5c65f-d74b-42b3-ad4b-dae0fbc211d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4105e5ca-3b5c-4608-b981-bbea85382c31" xlink:to="loc_us-gaap_DebtInstrumentAxis_47f5c65f-d74b-42b3-ad4b-dae0fbc211d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_47f5c65f-d74b-42b3-ad4b-dae0fbc211d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_47f5c65f-d74b-42b3-ad4b-dae0fbc211d2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_47f5c65f-d74b-42b3-ad4b-dae0fbc211d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_8971ab11-aa6f-4937-94e5-99666934aab7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_47f5c65f-d74b-42b3-ad4b-dae0fbc211d2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_8971ab11-aa6f-4937-94e5-99666934aab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SeniorSecuredTermLoanBMaturingMarch2029Member_166fc29c-82ae-46be-bfe6-ce93ad6dc026" xlink:href="embc-20250630.xsd#embc_SeniorSecuredTermLoanBMaturingMarch2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8971ab11-aa6f-4937-94e5-99666934aab7" xlink:to="loc_embc_SeniorSecuredTermLoanBMaturingMarch2029Member_166fc29c-82ae-46be-bfe6-ce93ad6dc026" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SeniorSecuredRevolvingCreditFacilityMaturing2027Member_235ca8e5-2296-4e99-8c40-fd1e016ad86a" xlink:href="embc-20250630.xsd#embc_SeniorSecuredRevolvingCreditFacilityMaturing2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8971ab11-aa6f-4937-94e5-99666934aab7" xlink:to="loc_embc_SeniorSecuredRevolvingCreditFacilityMaturing2027Member_235ca8e5-2296-4e99-8c40-fd1e016ad86a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A500SeniorSecuredNotesDueFebruary2030Member_85befbe1-9aa0-4bc8-bd7f-8dc8ad84e8a0" xlink:href="embc-20250630.xsd#embc_A500SeniorSecuredNotesDueFebruary2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8971ab11-aa6f-4937-94e5-99666934aab7" xlink:to="loc_embc_A500SeniorSecuredNotesDueFebruary2030Member_85befbe1-9aa0-4bc8-bd7f-8dc8ad84e8a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A675SeniorSecuredNotesDueFebruary2030Member_0484d474-a1bc-413f-bbb9-aa7ebc3aa663" xlink:href="embc-20250630.xsd#embc_A675SeniorSecuredNotesDueFebruary2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_8971ab11-aa6f-4937-94e5-99666934aab7" xlink:to="loc_embc_A675SeniorSecuredNotesDueFebruary2030Member_0484d474-a1bc-413f-bbb9-aa7ebc3aa663" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_51de9110-f93e-4aa9-bc81-143134673f3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4105e5ca-3b5c-4608-b981-bbea85382c31" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_51de9110-f93e-4aa9-bc81-143134673f3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_51de9110-f93e-4aa9-bc81-143134673f3e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_51de9110-f93e-4aa9-bc81-143134673f3e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_51de9110-f93e-4aa9-bc81-143134673f3e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_8b73d0d5-5bed-4e6b-ab35-1fe1da9ce1a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_51de9110-f93e-4aa9-bc81-143134673f3e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_8b73d0d5-5bed-4e6b-ab35-1fe1da9ce1a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_d435401d-9bf0-4c88-b190-f916ed53f768" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_8b73d0d5-5bed-4e6b-ab35-1fe1da9ce1a0" xlink:to="loc_us-gaap_SecuredDebtMember_d435401d-9bf0-4c88-b190-f916ed53f768" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_004dcdaf-9111-4131-a75a-63b34c973e88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_8b73d0d5-5bed-4e6b-ab35-1fe1da9ce1a0" xlink:to="loc_us-gaap_SeniorNotesMember_004dcdaf-9111-4131-a75a-63b34c973e88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_7e071b50-d242-4425-acbf-88b9f52070c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4105e5ca-3b5c-4608-b981-bbea85382c31" xlink:to="loc_us-gaap_CreditFacilityAxis_7e071b50-d242-4425-acbf-88b9f52070c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_7e071b50-d242-4425-acbf-88b9f52070c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_7e071b50-d242-4425-acbf-88b9f52070c9" xlink:to="loc_us-gaap_CreditFacilityDomain_7e071b50-d242-4425-acbf-88b9f52070c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_4cd5a942-ebcb-41df-a500-3960cb826c52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_7e071b50-d242-4425-acbf-88b9f52070c9" xlink:to="loc_us-gaap_CreditFacilityDomain_4cd5a942-ebcb-41df-a500-3960cb826c52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_2392571f-dc17-4b4e-9b71-ddabf579080b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_4cd5a942-ebcb-41df-a500-3960cb826c52" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_2392571f-dc17-4b4e-9b71-ddabf579080b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_bce2f26a-23b2-4026-beec-16e1e3817943" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4105e5ca-3b5c-4608-b981-bbea85382c31" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_bce2f26a-23b2-4026-beec-16e1e3817943" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_bce2f26a-23b2-4026-beec-16e1e3817943_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_bce2f26a-23b2-4026-beec-16e1e3817943" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_bce2f26a-23b2-4026-beec-16e1e3817943_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_9e384b1d-ac93-4c86-9da8-b85879c26fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_bce2f26a-23b2-4026-beec-16e1e3817943" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_9e384b1d-ac93-4c86-9da8-b85879c26fcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c5797726-a683-4f56-a46a-ea3d34cff371" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_9e384b1d-ac93-4c86-9da8-b85879c26fcf" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c5797726-a683-4f56-a46a-ea3d34cff371" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_8f5c5372-35ae-4b59-908f-f31324aec729" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c5797726-a683-4f56-a46a-ea3d34cff371" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_8f5c5372-35ae-4b59-908f-f31324aec729" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_b389e03f-8ae1-40ec-8a54-7a4fff74b17c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_c5797726-a683-4f56-a46a-ea3d34cff371" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_b389e03f-8ae1-40ec-8a54-7a4fff74b17c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_38d4d898-8a75-49c1-ae0e-184bf3c1995c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_4105e5ca-3b5c-4608-b981-bbea85382c31" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_38d4d898-8a75-49c1-ae0e-184bf3c1995c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_38d4d898-8a75-49c1-ae0e-184bf3c1995c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_38d4d898-8a75-49c1-ae0e-184bf3c1995c" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_38d4d898-8a75-49c1-ae0e-184bf3c1995c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a0c28174-96fb-470e-8d30-bb0e242add53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_38d4d898-8a75-49c1-ae0e-184bf3c1995c" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a0c28174-96fb-470e-8d30-bb0e242add53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_0beab198-bf00-4d81-8d8a-e1f1cc583b23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_a0c28174-96fb-470e-8d30-bb0e242add53" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_0beab198-bf00-4d81-8d8a-e1f1cc583b23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_dda77f00-7274-4396-9cd0-3fc1c63972e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_dda77f00-7274-4396-9cd0-3fc1c63972e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_be41d2ef-db02-4fa0-a580-96113e12c90a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_DebtInstrumentTerm_be41d2ef-db02-4fa0-a580-96113e12c90a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_212e639b-f599-4b75-b35a-094d0b39da1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_212e639b-f599-4b75-b35a-094d0b39da1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_DebtInstrumentVariableRateFloor_c42545fb-f36d-4502-92c8-b9b1b0d03347" xlink:href="embc-20250630.xsd#embc_DebtInstrumentVariableRateFloor"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_embc_DebtInstrumentVariableRateFloor_c42545fb-f36d-4502-92c8-b9b1b0d03347" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_DebtInstrumentDiscountPercentage_a83d6ae3-b1c5-434e-a752-e99c35252b69" xlink:href="embc-20250630.xsd#embc_DebtInstrumentDiscountPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_embc_DebtInstrumentDiscountPercentage_a83d6ae3-b1c5-434e-a752-e99c35252b69" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_DebtInstrumentPeriodicPaymentPrincipalPercentage_464e30c6-1b25-47b1-a2d4-b7cee0ef9f4f" xlink:href="embc-20250630.xsd#embc_DebtInstrumentPeriodicPaymentPrincipalPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_embc_DebtInstrumentPeriodicPaymentPrincipalPercentage_464e30c6-1b25-47b1-a2d4-b7cee0ef9f4f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_81deb30a-3386-4dc0-afa0-a1238184214b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_81deb30a-3386-4dc0-afa0-a1238184214b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_3ad45970-e504-40a5-b915-526e8c991493" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_3ad45970-e504-40a5-b915-526e8c991493" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_bbbaddac-0f0b-4080-8191-c693e0b45751" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_LineOfCredit_bbbaddac-0f0b-4080-8191-c693e0b45751" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_136c9eb6-2b23-4a7a-8315-83927e595ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_136c9eb6-2b23-4a7a-8315-83927e595ea2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_2f6d911b-baa3-4e43-8212-cffdb0154d0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_2f6d911b-baa3-4e43-8212-cffdb0154d0d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_df6e9fd0-ad5b-4b35-86f8-070f3068a292" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_InterestPaidNet_df6e9fd0-ad5b-4b35-86f8-070f3068a292" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_7ce8e961-279a-4077-b313-bd8a682cd5da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_7ce8e961-279a-4077-b313-bd8a682cd5da" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt_005b8c54-ad59-49a1-9ac8-e4d1c2304d6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_RepaymentsOfSecuredDebt_005b8c54-ad59-49a1-9ac8-e4d1c2304d6e" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_6b3f0afc-3ded-44f7-a47a-dc6a6735314c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_6b3f0afc-3ded-44f7-a47a-dc6a6735314c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_33b33058-5dba-4ccb-84d3-e5f4da10b3ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10954416-21c4-49db-938d-24cdd4e88937" xlink:to="loc_us-gaap_LongTermDebtFairValue_33b33058-5dba-4ccb-84d3-e5f4da10b3ce" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/LongTermDebtDebtOutstandingDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#LongTermDebtDebtOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/LongTermDebtDebtOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_5d87f13e-3b05-41dd-9f1c-b709adb4ce79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_f1655436-4ce3-4d94-8730-fe3a14cc1cb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d87f13e-3b05-41dd-9f1c-b709adb4ce79" xlink:to="loc_us-gaap_DebtInstrumentTable_f1655436-4ce3-4d94-8730-fe3a14cc1cb6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f2a5a0bf-5c27-445a-bb28-cb3a096f57ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f1655436-4ce3-4d94-8730-fe3a14cc1cb6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f2a5a0bf-5c27-445a-bb28-cb3a096f57ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f2a5a0bf-5c27-445a-bb28-cb3a096f57ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f2a5a0bf-5c27-445a-bb28-cb3a096f57ce" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f2a5a0bf-5c27-445a-bb28-cb3a096f57ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7bf9d797-fbde-419f-b564-22d834013073" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f2a5a0bf-5c27-445a-bb28-cb3a096f57ce" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7bf9d797-fbde-419f-b564-22d834013073" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_9b9fa9cf-ab5d-491c-99e6-c59c49db32c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7bf9d797-fbde-419f-b564-22d834013073" xlink:to="loc_us-gaap_SecuredDebtMember_9b9fa9cf-ab5d-491c-99e6-c59c49db32c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_52bcbbaf-502a-4694-a47e-bf9e14096cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7bf9d797-fbde-419f-b564-22d834013073" xlink:to="loc_us-gaap_SeniorNotesMember_52bcbbaf-502a-4694-a47e-bf9e14096cd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_6804825c-2514-4bdd-be9c-42fc059793fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f1655436-4ce3-4d94-8730-fe3a14cc1cb6" xlink:to="loc_us-gaap_DebtInstrumentAxis_6804825c-2514-4bdd-be9c-42fc059793fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6804825c-2514-4bdd-be9c-42fc059793fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_6804825c-2514-4bdd-be9c-42fc059793fd" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6804825c-2514-4bdd-be9c-42fc059793fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d8e13e53-f8f6-4edd-9377-71d3c6fe23ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_6804825c-2514-4bdd-be9c-42fc059793fd" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d8e13e53-f8f6-4edd-9377-71d3c6fe23ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_SeniorSecuredTermLoanBMaturingMarch2029Member_db4c94c9-4ca0-4dc5-837c-2c161e697ec5" xlink:href="embc-20250630.xsd#embc_SeniorSecuredTermLoanBMaturingMarch2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d8e13e53-f8f6-4edd-9377-71d3c6fe23ca" xlink:to="loc_embc_SeniorSecuredTermLoanBMaturingMarch2029Member_db4c94c9-4ca0-4dc5-837c-2c161e697ec5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A500SeniorSecuredNotesDueFebruary2030Member_7368f233-1577-44ad-acc0-65eda59d7582" xlink:href="embc-20250630.xsd#embc_A500SeniorSecuredNotesDueFebruary2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d8e13e53-f8f6-4edd-9377-71d3c6fe23ca" xlink:to="loc_embc_A500SeniorSecuredNotesDueFebruary2030Member_7368f233-1577-44ad-acc0-65eda59d7582" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_A675SeniorSecuredNotesDueFebruary2030Member_bdb143c2-abe6-4955-be42-27501c81f424" xlink:href="embc-20250630.xsd#embc_A675SeniorSecuredNotesDueFebruary2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_d8e13e53-f8f6-4edd-9377-71d3c6fe23ca" xlink:to="loc_embc_A675SeniorSecuredNotesDueFebruary2030Member_bdb143c2-abe6-4955-be42-27501c81f424" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_398326f7-0b28-4701-987d-e17f08835ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d87f13e-3b05-41dd-9f1c-b709adb4ce79" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_398326f7-0b28-4701-987d-e17f08835ff0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_d624fb69-8762-4bd6-8abb-b1449f2bfa68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d87f13e-3b05-41dd-9f1c-b709adb4ce79" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_d624fb69-8762-4bd6-8abb-b1449f2bfa68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_ceac9b69-7917-4de1-bef7-8cb17128aa49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d87f13e-3b05-41dd-9f1c-b709adb4ce79" xlink:to="loc_us-gaap_LongTermDebtCurrent_ceac9b69-7917-4de1-bef7-8cb17128aa49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_d9df4749-fca6-4160-9b5c-48471783250b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d87f13e-3b05-41dd-9f1c-b709adb4ce79" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_d9df4749-fca6-4160-9b5c-48471783250b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_643aa4f5-b12b-45c4-aa69-a91b5f045904" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d87f13e-3b05-41dd-9f1c-b709adb4ce79" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_643aa4f5-b12b-45c4-aa69-a91b5f045904" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/FinancialInstrumentsandFairValueMeasurementsAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#FinancialInstrumentsandFairValueMeasurementsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/FinancialInstrumentsandFairValueMeasurementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_118f4688-8c02-4e42-93ab-63990fed50e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_3ae6c75e-15c5-4e13-baaa-74b91c3bc35b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_118f4688-8c02-4e42-93ab-63990fed50e7" xlink:to="loc_us-gaap_ConcentrationRiskTable_3ae6c75e-15c5-4e13-baaa-74b91c3bc35b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_02dcd1c8-8154-4998-a749-d800c2730450" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_3ae6c75e-15c5-4e13-baaa-74b91c3bc35b" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_02dcd1c8-8154-4998-a749-d800c2730450" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_02dcd1c8-8154-4998-a749-d800c2730450_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_02dcd1c8-8154-4998-a749-d800c2730450" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_02dcd1c8-8154-4998-a749-d800c2730450_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_69430eca-9765-4076-9cab-683cc0ac0284" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_02dcd1c8-8154-4998-a749-d800c2730450" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_69430eca-9765-4076-9cab-683cc0ac0284" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_5b7a70ab-08f3-4979-be2f-0fdf097a6d94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_69430eca-9765-4076-9cab-683cc0ac0284" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_5b7a70ab-08f3-4979-be2f-0fdf097a6d94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_00f3cd61-4d58-46c3-895b-0115840a45af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_3ae6c75e-15c5-4e13-baaa-74b91c3bc35b" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_00f3cd61-4d58-46c3-895b-0115840a45af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_00f3cd61-4d58-46c3-895b-0115840a45af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_00f3cd61-4d58-46c3-895b-0115840a45af" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_00f3cd61-4d58-46c3-895b-0115840a45af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_cce092ae-82ed-481d-b715-b73c42be0b51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_00f3cd61-4d58-46c3-895b-0115840a45af" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_cce092ae-82ed-481d-b715-b73c42be0b51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_8d7fee41-946f-4a56-9f2c-25284e8af819" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_cce092ae-82ed-481d-b715-b73c42be0b51" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_8d7fee41-946f-4a56-9f2c-25284e8af819" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_8e357c55-06a7-4a4b-84bd-98d402350d09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_cce092ae-82ed-481d-b715-b73c42be0b51" xlink:to="loc_us-gaap_AccountsReceivableMember_8e357c55-06a7-4a4b-84bd-98d402350d09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_d3fae0a8-6f2e-422c-93ae-45de7105391b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_3ae6c75e-15c5-4e13-baaa-74b91c3bc35b" xlink:to="loc_srt_MajorCustomersAxis_d3fae0a8-6f2e-422c-93ae-45de7105391b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_d3fae0a8-6f2e-422c-93ae-45de7105391b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_d3fae0a8-6f2e-422c-93ae-45de7105391b" xlink:to="loc_srt_NameOfMajorCustomerDomain_d3fae0a8-6f2e-422c-93ae-45de7105391b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_b62e3e6e-bab9-472a-bf38-ace4d725de57" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_d3fae0a8-6f2e-422c-93ae-45de7105391b" xlink:to="loc_srt_NameOfMajorCustomerDomain_b62e3e6e-bab9-472a-bf38-ace4d725de57" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_CustomerOneCustomerTwoAndCustomerThreeMember_11561f02-4cc3-4dd5-a9e1-45ba9c291d2a" xlink:href="embc-20250630.xsd#embc_CustomerOneCustomerTwoAndCustomerThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_b62e3e6e-bab9-472a-bf38-ace4d725de57" xlink:to="loc_embc_CustomerOneCustomerTwoAndCustomerThreeMember_11561f02-4cc3-4dd5-a9e1-45ba9c291d2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_embc_CustomerOneAndCustomerTwoMember_98904710-6203-47f0-8c42-864c1d62ecee" xlink:href="embc-20250630.xsd#embc_CustomerOneAndCustomerTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_b62e3e6e-bab9-472a-bf38-ace4d725de57" xlink:to="loc_embc_CustomerOneAndCustomerTwoMember_98904710-6203-47f0-8c42-864c1d62ecee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_9fcd92be-af77-4875-bf43-260285f5225d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_3ae6c75e-15c5-4e13-baaa-74b91c3bc35b" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_9fcd92be-af77-4875-bf43-260285f5225d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_9fcd92be-af77-4875-bf43-260285f5225d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_9fcd92be-af77-4875-bf43-260285f5225d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_9fcd92be-af77-4875-bf43-260285f5225d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_f90e263d-34a1-41d2-b54d-53e0bc3658f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_9fcd92be-af77-4875-bf43-260285f5225d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_f90e263d-34a1-41d2-b54d-53e0bc3658f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_a7580fe2-b2c7-498e-9172-31cbddfcc009" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_f90e263d-34a1-41d2-b54d-53e0bc3658f4" xlink:to="loc_us-gaap_CostOfSalesMember_a7580fe2-b2c7-498e-9172-31cbddfcc009" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_7830fec5-8931-45d0-a47c-7423f62e0b1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_f90e263d-34a1-41d2-b54d-53e0bc3658f4" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_7830fec5-8931-45d0-a47c-7423f62e0b1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOther_2fbab61b-12ce-4d9f-8845-8d10c2910a07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_118f4688-8c02-4e42-93ab-63990fed50e7" xlink:to="loc_us-gaap_InterestIncomeOther_2fbab61b-12ce-4d9f-8845-8d10c2910a07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_eb6282dd-483b-47cd-8363-6250b7c76856" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TangibleAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_118f4688-8c02-4e42-93ab-63990fed50e7" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_eb6282dd-483b-47cd-8363-6250b7c76856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_3f18e14a-822b-4ee2-bcc3-3d3096d8aeae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_118f4688-8c02-4e42-93ab-63990fed50e7" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_3f18e14a-822b-4ee2-bcc3-3d3096d8aeae" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/FinancialInstrumentsandFairValueMeasurementsNotionalAmountsofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#FinancialInstrumentsandFairValueMeasurementsNotionalAmountsofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/FinancialInstrumentsandFairValueMeasurementsNotionalAmountsofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_588049b4-d0c0-49b5-bb62-c0a15b66a5a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_54cc1c2f-3431-4dbc-950e-34d3b938d365" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_588049b4-d0c0-49b5-bb62-c0a15b66a5a3" xlink:to="loc_us-gaap_DerivativeTable_54cc1c2f-3431-4dbc-950e-34d3b938d365" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_4ef46a01-605d-4518-aac1-accd54d02b30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_54cc1c2f-3431-4dbc-950e-34d3b938d365" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_4ef46a01-605d-4518-aac1-accd54d02b30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_4ef46a01-605d-4518-aac1-accd54d02b30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4ef46a01-605d-4518-aac1-accd54d02b30" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_4ef46a01-605d-4518-aac1-accd54d02b30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_ee54fe7a-a43e-4be3-bb8b-e5178d49495f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_4ef46a01-605d-4518-aac1-accd54d02b30" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_ee54fe7a-a43e-4be3-bb8b-e5178d49495f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_0ce52583-b90f-4eb3-97f3-7e8e2aba36ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_ee54fe7a-a43e-4be3-bb8b-e5178d49495f" xlink:to="loc_us-gaap_ForeignExchangeContractMember_0ce52583-b90f-4eb3-97f3-7e8e2aba36ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_97538185-737f-4086-8879-b179d826ea95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_54cc1c2f-3431-4dbc-950e-34d3b938d365" xlink:to="loc_us-gaap_HedgingDesignationAxis_97538185-737f-4086-8879-b179d826ea95" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_97538185-737f-4086-8879-b179d826ea95_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_97538185-737f-4086-8879-b179d826ea95" xlink:to="loc_us-gaap_HedgingDesignationDomain_97538185-737f-4086-8879-b179d826ea95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_e516f110-e3cb-422c-b467-be1bdd42484d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_97538185-737f-4086-8879-b179d826ea95" xlink:to="loc_us-gaap_HedgingDesignationDomain_e516f110-e3cb-422c-b467-be1bdd42484d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_b106e27c-114c-4aee-bacd-113fdfd38c49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_e516f110-e3cb-422c-b467-be1bdd42484d" xlink:to="loc_us-gaap_NondesignatedMember_b106e27c-114c-4aee-bacd-113fdfd38c49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_37b5b706-ed28-45e3-ab0e-beb67ef94609" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_588049b4-d0c0-49b5-bb62-c0a15b66a5a3" xlink:to="loc_us-gaap_DerivativeNotionalAmount_37b5b706-ed28-45e3-ab0e-beb67ef94609" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/PropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#PropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/PropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_461c3dee-4ac2-43b5-96e3-cbfb1b769614" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_81a1b85f-1a97-4313-ac39-25cca119efbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_461c3dee-4ac2-43b5-96e3-cbfb1b769614" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_81a1b85f-1a97-4313-ac39-25cca119efbf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1a5ec8fe-ea20-4eb0-a12f-07397ed09724" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_81a1b85f-1a97-4313-ac39-25cca119efbf" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1a5ec8fe-ea20-4eb0-a12f-07397ed09724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_1a5ec8fe-ea20-4eb0-a12f-07397ed09724_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1a5ec8fe-ea20-4eb0-a12f-07397ed09724" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_1a5ec8fe-ea20-4eb0-a12f-07397ed09724_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_09830097-60cd-480b-86b8-c8e3bac2cc41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_1a5ec8fe-ea20-4eb0-a12f-07397ed09724" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_09830097-60cd-480b-86b8-c8e3bac2cc41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_025c5660-24c7-4813-aa5b-ab5239049500" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_09830097-60cd-480b-86b8-c8e3bac2cc41" xlink:to="loc_us-gaap_LandMember_025c5660-24c7-4813-aa5b-ab5239049500" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_69e0d756-b661-46b5-8a7d-01b66429d988" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_09830097-60cd-480b-86b8-c8e3bac2cc41" xlink:to="loc_us-gaap_BuildingMember_69e0d756-b661-46b5-8a7d-01b66429d988" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_69ccb260-3122-4886-8e5d-3481cfe71fab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_09830097-60cd-480b-86b8-c8e3bac2cc41" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_69ccb260-3122-4886-8e5d-3481cfe71fab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_25e26d2b-db12-4f02-b83a-43e306bf4a54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_09830097-60cd-480b-86b8-c8e3bac2cc41" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_25e26d2b-db12-4f02-b83a-43e306bf4a54" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_288ad38c-21c8-474f-b63f-251b8d86f1d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_09830097-60cd-480b-86b8-c8e3bac2cc41" xlink:to="loc_us-gaap_ConstructionInProgressMember_288ad38c-21c8-474f-b63f-251b8d86f1d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_22d3a02e-ffd8-4311-bd64-072868d42b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_461c3dee-4ac2-43b5-96e3-cbfb1b769614" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_22d3a02e-ffd8-4311-bd64-072868d42b6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_adbb645b-c0f5-4360-87bc-1e9d61c8ae15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_461c3dee-4ac2-43b5-96e3-cbfb1b769614" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_adbb645b-c0f5-4360-87bc-1e9d61c8ae15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_ef1233c3-e7db-4644-85c8-8a85950e6194" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_461c3dee-4ac2-43b5-96e3-cbfb1b769614" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_ef1233c3-e7db-4644-85c8-8a85950e6194" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.embecta.com/role/PropertyPlantandEquipmentAdditionalInformationDetails" xlink:type="simple" xlink:href="embc-20250630.xsd#PropertyPlantandEquipmentAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.embecta.com/role/PropertyPlantandEquipmentAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_e9e57548-718d-4135-bee7-45af2865dc40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1ab3af09-1d39-4a3b-ae5a-0a949a1e82d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_e9e57548-718d-4135-bee7-45af2865dc40" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1ab3af09-1d39-4a3b-ae5a-0a949a1e82d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_df5cb80a-f2ef-4233-beea-cfefb81db204" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_1ab3af09-1d39-4a3b-ae5a-0a949a1e82d5" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_df5cb80a-f2ef-4233-beea-cfefb81db204" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_df5cb80a-f2ef-4233-beea-cfefb81db204_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_df5cb80a-f2ef-4233-beea-cfefb81db204" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_df5cb80a-f2ef-4233-beea-cfefb81db204_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_5a63794d-cf1f-4fca-aaa9-c3e1cba1a93d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_df5cb80a-f2ef-4233-beea-cfefb81db204" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_5a63794d-cf1f-4fca-aaa9-c3e1cba1a93d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_c363f65c-0761-4176-82e8-da0e34ce3f89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_5a63794d-cf1f-4fca-aaa9-c3e1cba1a93d" xlink:to="loc_us-gaap_CostOfSalesMember_c363f65c-0761-4176-82e8-da0e34ce3f89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_3e2f5e95-ff15-4513-8880-8264f6b8ae34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_5a63794d-cf1f-4fca-aaa9-c3e1cba1a93d" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_3e2f5e95-ff15-4513-8880-8264f6b8ae34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_739223c6-41e6-4daa-a080-8b4bc4d52199" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TangibleAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_e9e57548-718d-4135-bee7-45af2865dc40" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_739223c6-41e6-4daa-a080-8b4bc4d52199" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndOtherAssetsNoncurrent" xlink:type="arc" order="102"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent" xlink:type="arc" order="91"/>
  </link:definitionLink>
</link:linkbase>
