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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:69135cb1-eb09-4d53-8a98-8beda52e5395,g:af7d4aef-e839-4912-a620-c96addadfa48-->
<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:arcroleRef arcroleURI="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/arcrole/esma-arcrole-2018-11-21.xsd#wider-narrower"/>
  <link:roleRef roleURI="http://www.airtificial.com/role/EstadodecambiosenelpatrimonionetoStatement" xlink:type="simple" xlink:href="95980020140005635004-2021-12-31.xsd#EstadodecambiosenelpatrimonionetoStatement"/>
  <link:definitionLink xlink:role="http://www.airtificial.com/role/EstadodecambiosenelpatrimonionetoStatement" xlink:type="extended" id="idbbc1534f97c44cb83af71ff025452f2_EstadodecambiosenelpatrimonionetoStatement">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_b475d7bf-fee4-40ca-bc2f-aad05da5f7a8" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:to="loc_ifrs-full_Equity_b475d7bf-fee4-40ca-bc2f-aad05da5f7a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome_0f2d74b4-2306-45fa-a11e-4c486aa31a97" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:to="loc_ifrs-full_ComprehensiveIncome_0f2d74b4-2306-45fa-a11e-4c486aa31a97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_186aad24-e519-4555-9334-98b8cd86f775" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_186aad24-e519-4555-9334-98b8cd86f775" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReductionOfIssuedCapital_91d8d8c0-4848-4e64-b11e-1b9dad9cfda3" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReductionOfIssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:to="loc_ifrs-full_ReductionOfIssuedCapital_91d8d8c0-4848-4e64-b11e-1b9dad9cfda3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssueOfEquity_2a9f692f-f5ae-4bf9-b1e2-3be750222a11" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssueOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:to="loc_ifrs-full_IssueOfEquity_2a9f692f-f5ae-4bf9-b1e2-3be750222a11" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_CreditCompensation_86328074-33ae-4223-922b-3a1bffc0f817" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_CreditCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:to="loc_airtificial_CreditCompensation_86328074-33ae-4223-922b-3a1bffc0f817" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_c61881d2-c6d6-4550-a98a-41d23cfded59" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_c61881d2-c6d6-4550-a98a-41d23cfded59" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_c533ef78-e420-403a-8404-10b5ce83d1e1" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_981e1880-fffc-44d7-871f-2e3275625f12" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_e98ce896-ec93-438c-a694-e776c14f4995" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_981e1880-fffc-44d7-871f-2e3275625f12" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="scenario"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_2b199941-031d-46cf-a3ea-f448b168a763" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_981e1880-fffc-44d7-871f-2e3275625f12" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_2b199941-031d-46cf-a3ea-f448b168a763" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_2b199941-031d-46cf-a3ea-f448b168a763" xlink:to="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_2eef68ab-40f6-439e-b341-104d3b0c4600" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_ifrs-full_IssuedCapitalMember_2eef68ab-40f6-439e-b341-104d3b0c4600" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharePremiumMember_d68bed17-79a2-422b-8afc-52844433356f" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SharePremiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_ifrs-full_SharePremiumMember_d68bed17-79a2-422b-8afc-52844433356f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ReservesOfTheParentCompanyMember_fb5ef78d-4b41-4aac-803d-4a091be13bcd" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ReservesOfTheParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_airtificial_ReservesOfTheParentCompanyMember_fb5ef78d-4b41-4aac-803d-4a091be13bcd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevaluationSurplusMember_e294b2f7-8194-4c8b-a088-5f695af9b708" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RevaluationSurplusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_ifrs-full_RevaluationSurplusMember_e294b2f7-8194-4c8b-a088-5f695af9b708" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_fddc195c-6371-4fa2-a363-b9da3ede0c38" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_fddc195c-6371-4fa2-a363-b9da3ede0c38" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReservesMember_1d8ca113-9859-487a-a734-db5ae5804b3b" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_ifrs-full_OtherReservesMember_1d8ca113-9859-487a-a734-db5ae5804b3b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProfitLossAttributableToOwnersOfParentMember_d93b63e2-2c93-4144-8770-0be411e6cc0e" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProfitLossAttributableToOwnersOfParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_airtificial_ProfitLossAttributableToOwnersOfParentMember_d93b63e2-2c93-4144-8770-0be411e6cc0e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_993d9254-047c-4cdf-ae6c-6935795f4c1f" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_993d9254-047c-4cdf-ae6c-6935795f4c1f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_00350bac-d465-4be8-8cb9-49145062bbe8" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncontrollingInterestsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_ad686244-198b-42bc-843e-5631220e65f3" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_00350bac-d465-4be8-8cb9-49145062bbe8" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.esma.europa.eu/xbrl/role/cor/esef_role-999999" xlink:type="simple" xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor.xsd#esef_role-999999"/>
  <link:definitionLink xlink:role="http://www.esma.europa.eu/xbrl/role/cor/esef_role-999999" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor.xsd#esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_68d7f14c-320e-4d06-9b13-20b39155820aNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_68d7f14c-320e-4d06-9b13-20b39155820aNotDimensionallyQualified" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DomicileOfEntity_b0c4c6da-1edc-415b-8aae-0381ec1cbf2dNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DomicileOfEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DomicileOfEntity_b0c4c6da-1edc-415b-8aae-0381ec1cbf2dNotDimensionallyQualified" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LegalFormOfEntity_7b688484-0dd1-4f14-a9ab-58a4eba86254NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LegalFormOfEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_LegalFormOfEntity_7b688484-0dd1-4f14-a9ab-58a4eba86254NotDimensionallyQualified" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PrincipalPlaceOfBusiness_5f48341f-76fa-4696-af30-2f28784e6f80NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PrincipalPlaceOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PrincipalPlaceOfBusiness_5f48341f-76fa-4696-af30-2f28784e6f80NotDimensionallyQualified" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CountryOfIncorporation_da7ede65-b4c9-4eb2-8f53-fa721b233f75NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CountryOfIncorporation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CountryOfIncorporation_da7ede65-b4c9-4eb2-8f53-fa721b233f75NotDimensionallyQualified" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity_d0f3a3c6-a3da-4226-a31f-2dc66ce62af5NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AddressOfRegisteredOfficeOfEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity_d0f3a3c6-a3da-4226-a31f-2dc66ce62af5NotDimensionallyQualified" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_7e5b26db-8ce3-40d0-aff7-c5c1612fc3d8NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_7e5b26db-8ce3-40d0-aff7-c5c1612fc3d8NotDimensionallyQualified" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfParentEntity_757ea735-69a7-4541-b523-7cef03eaec7fNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfParentEntity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfParentEntity_757ea735-69a7-4541-b523-7cef03eaec7fNotDimensionallyQualified" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NameOfUltimateParentOfGroup_ddd55ad3-aae8-45d2-8776-6339b255f6b2NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfUltimateParentOfGroup"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfUltimateParentOfGroup_ddd55ad3-aae8-45d2-8776-6339b255f6b2NotDimensionallyQualified" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwill_9d70990e-034d-47e7-83f4-068a77d1494cNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IntangibleAssetsAndGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwill_9d70990e-034d-47e7-83f4-068a77d1494cNotDimensionallyQualified" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Goodwill_4517f3b3-6b3d-4e02-bc71-b3183b39d9eeNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Goodwill_4517f3b3-6b3d-4e02-bc71-b3183b39d9eeNotDimensionallyQualified" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherIntangibleAssets_407da46f-3e11-4d51-8106-e490829491f8NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherIntangibleAssets_407da46f-3e11-4d51-8106-e490829491f8NotDimensionallyQualified" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_784da8ab-d9a4-4f97-adea-0efca7ede72eNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_784da8ab-d9a4-4f97-adea-0efca7ede72eNotDimensionallyQualified" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LandAndBuildings_f76ac987-9614-48dd-9224-e81bb652e477NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LandAndBuildings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_LandAndBuildings_f76ac987-9614-48dd-9224-e81bb652e477NotDimensionallyQualified" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherPropertyPlantAndEquipment_f5979b16-e4ee-45b0-b9ff-1f2df7f34d9fNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherPropertyPlantAndEquipment_f5979b16-e4ee-45b0-b9ff-1f2df7f34d9fNotDimensionallyQualified" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_3a96cbf2-eb6d-42cd-a5ba-3cbb29e75423NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_3a96cbf2-eb6d-42cd-a5ba-3cbb29e75423NotDimensionallyQualified" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentFinancialAssets_3977c059-3b58-44bc-974d-177532cc652cNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentFinancialAssets_3977c059-3b58-44bc-974d-177532cc652cNotDimensionallyQualified" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxAssets_3002eba9-7175-4dfc-a069-111e6337cc7fNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DeferredTaxAssets_3002eba9-7175-4dfc-a069-111e6337cc7fNotDimensionallyQualified" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets_29d8ad1b-daec-46a7-b951-821d1f707887NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentAssets_29d8ad1b-daec-46a7-b951-821d1f707887NotDimensionallyQualified" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_9d4026b1-76a8-4ae9-914f-6200dd3afbc5NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_9d4026b1-76a8-4ae9-914f-6200dd3afbc5NotDimensionallyQualified" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Inventories_d9a9d810-153a-4700-8bb3-631f187d5cb9NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Inventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Inventories_d9a9d810-153a-4700-8bb3-631f187d5cb9NotDimensionallyQualified" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables_7f759ae9-59ae-44c0-b813-c3643cff1af0NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_TradeAndOtherCurrentReceivables_7f759ae9-59ae-44c0-b813-c3643cff1af0NotDimensionallyQualified" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTradeReceivables_591d613c-d95e-4269-b2c4-7ead38242d28NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTradeReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentTradeReceivables_591d613c-d95e-4269-b2c4-7ead38242d28NotDimensionallyQualified" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_CurrentReceivablesAndOtherAssets_26648e97-dd55-463d-a672-b948cabd7de2NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_CurrentReceivablesAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_CurrentReceivablesAndOtherAssets_26648e97-dd55-463d-a672-b948cabd7de2NotDimensionallyQualified" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_TaxReceivables_64a36802-0fde-42c0-a945-e4f9bf11f041NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_TaxReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_TaxReceivables_64a36802-0fde-42c0-a945-e4f9bf11f041NotDimensionallyQualified" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentFinancialAssets_05633e8b-8a61-4f2c-80f1-0cb9538a8321NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherCurrentFinancialAssets_05633e8b-8a61-4f2c-80f1-0cb9538a8321NotDimensionallyQualified" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentAssets_1c1e3f60-0513-4c98-9205-21a01b4a7efeNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherCurrentAssets_1c1e3f60-0513-4c98-9205-21a01b4a7efeNotDimensionallyQualified" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents_f5d2ae7d-58f5-41e4-ab11-b4f0b0b30285NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashAndCashEquivalents_f5d2ae7d-58f5-41e4-ab11-b4f0b0b30285NotDimensionallyQualified" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets_20c87f60-d8f6-4165-8d46-04f77b268825NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentAssets_20c87f60-d8f6-4165-8d46-04f77b268825NotDimensionallyQualified" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_01f11a5d-cc70-4564-a2ca-6badd258b210NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Assets_01f11a5d-cc70-4564-a2ca-6badd258b210NotDimensionallyQualified" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_11c31744-83b5-4ffd-ab19-1be8825a2fc8NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IssuedCapital_11c31744-83b5-4ffd-ab19-1be8825a2fc8NotDimensionallyQualified" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ReservesOfTheParentCompany_93840739-1706-4df6-a0e2-06a1a4ec514eNotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ReservesOfTheParentCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ReservesOfTheParentCompany_93840739-1706-4df6-a0e2-06a1a4ec514eNotDimensionallyQualified" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome_a5fffbaf-4997-4f76-8bda-a98e5691787bNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome_a5fffbaf-4997-4f76-8bda-a98e5691787bNotDimensionallyQualified" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslation_a9cb2e8b-7949-4280-aa52-a5079beb1ce9NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslation_a9cb2e8b-7949-4280-aa52-a5079beb1ce9NotDimensionallyQualified" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarnings_38bf1282-521d-42b9-94cc-7037b78db3b3NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetainedEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RetainedEarnings_38bf1282-521d-42b9-94cc-7037b78db3b3NotDimensionallyQualified" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_502a112e-45dd-440d-a923-d8eab5766f67NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParent_502a112e-45dd-440d-a923-d8eab5766f67NotDimensionallyQualified" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterests_239b1270-e265-4c47-8391-753935e32560NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncontrollingInterests_239b1270-e265-4c47-8391-753935e32560NotDimensionallyQualified" xlink:type="arc" order="36"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_2ef951e0-91af-4d1f-82a3-f76b47ec9e53NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Equity_2ef951e0-91af-4d1f-82a3-f76b47ec9e53NotDimensionallyQualified" xlink:type="arc" order="37"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowings_511cb992-bfb0-4bca-a898-95515f1a1cb3NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LongtermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_LongtermBorrowings_511cb992-bfb0-4bca-a898-95515f1a1cb3NotDimensionallyQualified" xlink:type="arc" order="38"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentFinancialLiabilities_b44192fa-be80-4524-a000-ddb8634fe536NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentFinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherNoncurrentFinancialLiabilities_b44192fa-be80-4524-a000-ddb8634fe536NotDimensionallyQualified" xlink:type="arc" order="39"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentLiabilities_5781103a-d286-4458-be75-aabe30d8b978NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherNoncurrentLiabilities_5781103a-d286-4458-be75-aabe30d8b978NotDimensionallyQualified" xlink:type="arc" order="40"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilities_4a91fc4e-4448-4fbb-a352-a3e8bf85a0b3NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DeferredTaxLiabilities_4a91fc4e-4448-4fbb-a352-a3e8bf85a0b3NotDimensionallyQualified" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities_887ebb4f-c2e3-4cc1-84c9-8ebcb9e941a6NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentLiabilities_887ebb4f-c2e3-4cc1-84c9-8ebcb9e941a6NotDimensionallyQualified" xlink:type="arc" order="42"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_1fe576fb-daf8-45ae-8c86-29ef3e122f4fNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_1fe576fb-daf8-45ae-8c86-29ef3e122f4fNotDimensionallyQualified" xlink:type="arc" order="43"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived_e740ebe8-b6fb-43c4-ba0c-c8ffcd27f4c8NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentLoansReceivedAndCurrentPortionOfNoncurrentLoansReceived_e740ebe8-b6fb-43c4-ba0c-c8ffcd27f4c8NotDimensionallyQualified" xlink:type="arc" order="44"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables_4ad39c34-c9bd-4f9a-ad8f-cc689664b83fNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_TradeAndOtherCurrentPayables_4ad39c34-c9bd-4f9a-ad8f-cc689664b83fNotDimensionallyQualified" xlink:type="arc" order="45"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_LiabilitiesForPurchasesOrProvisionOfServices_b3b12b2b-0bd2-4074-9924-091ae8886b53NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_LiabilitiesForPurchasesOrProvisionOfServices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_LiabilitiesForPurchasesOrProvisionOfServices_b3b12b2b-0bd2-4074-9924-091ae8886b53NotDimensionallyQualified" xlink:type="arc" order="46"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAdvances_c3762db8-e480-4411-8580-7835198986dcNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAdvances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentAdvances_c3762db8-e480-4411-8580-7835198986dcNotDimensionallyQualified" xlink:type="arc" order="47"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentFinancialLiabilities_e6e71f29-bc60-424b-b8a3-32bc735645caNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentFinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherCurrentFinancialLiabilities_e6e71f29-bc60-424b-b8a3-32bc735645caNotDimensionallyQualified" xlink:type="arc" order="48"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentLiabilities_6fbccf10-450d-42c4-923d-2cf56e882725NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherCurrentLiabilities_6fbccf10-450d-42c4-923d-2cf56e882725NotDimensionallyQualified" xlink:type="arc" order="49"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities_af1cec7f-165f-4484-8644-5a6fa396b969NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CurrentLiabilities_af1cec7f-165f-4484-8644-5a6fa396b969NotDimensionallyQualified" xlink:type="arc" order="50"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities_496b10a4-0bdc-4e3c-bcab-e7208bd6f7abNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_EquityAndLiabilities_496b10a4-0bdc-4e3c-bcab-e7208bd6f7abNotDimensionallyQualified" xlink:type="arc" order="51"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_02393e90-b3b5-4db8-8afa-21d06376e14dNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Revenue_02393e90-b3b5-4db8-8afa-21d06376e14dNotDimensionallyQualified" xlink:type="arc" order="52"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInInventoriesOfFinishedGoodsAndWorkInProgress_b6409ce0-211a-45c9-b0f3-f3f24e76b4f4NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ChangesInInventoriesOfFinishedGoodsAndWorkInProgress"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ChangesInInventoriesOfFinishedGoodsAndWorkInProgress_b6409ce0-211a-45c9-b0f3-f3f24e76b4f4NotDimensionallyQualified" xlink:type="arc" order="53"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories_233a7908-2e98-48c0-889f-7593db8dc682NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories_233a7908-2e98-48c0-889f-7593db8dc682NotDimensionallyQualified" xlink:type="arc" order="54"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherWorkPerformedByEntityAndCapitalised_5809e09a-45d9-4579-9eac-18c05bd545c1NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherWorkPerformedByEntityAndCapitalised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherWorkPerformedByEntityAndCapitalised_5809e09a-45d9-4579-9eac-18c05bd545c1NotDimensionallyQualified" xlink:type="arc" order="55"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RawMaterialsAndConsumablesUsed_be1f4591-0cfd-4db1-9c92-bba88d3e7ae0NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RawMaterialsAndConsumablesUsed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RawMaterialsAndConsumablesUsed_be1f4591-0cfd-4db1-9c92-bba88d3e7ae0NotDimensionallyQualified" xlink:type="arc" order="56"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherIncome_2ba0fc59-93b2-43e6-b129-16e670a08089NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherIncome_2ba0fc59-93b2-43e6-b129-16e670a08089NotDimensionallyQualified" xlink:type="arc" order="57"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EmployeeBenefitsExpense_074ef6b8-c56c-45bc-8161-59514ff63497NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EmployeeBenefitsExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_EmployeeBenefitsExpense_074ef6b8-c56c-45bc-8161-59514ff63497NotDimensionallyQualified" xlink:type="arc" order="58"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherEmployeeExpense_8fe160db-2204-41b3-8b6e-f45cfb71b552NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherEmployeeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherEmployeeExpense_8fe160db-2204-41b3-8b6e-f45cfb71b552NotDimensionallyQualified" xlink:type="arc" order="59"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherExpenseByNature_8236e5bc-8526-450a-aee8-f82c6068e24aNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherExpenseByNature"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherExpenseByNature_8236e5bc-8526-450a-aee8-f82c6068e24aNotDimensionallyQualified" xlink:type="arc" order="60"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossTradeReceivables_4b04dc6e-ba12-4e67-820f-623e87770b42NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossTradeReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossTradeReceivables_4b04dc6e-ba12-4e67-820f-623e87770b42NotDimensionallyQualified" xlink:type="arc" order="61"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationAndAmortisationExpense_f21b84e9-6948-40c8-a139-fd50ad5485caNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DepreciationAndAmortisationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DepreciationAndAmortisationExpense_f21b84e9-6948-40c8-a139-fd50ad5485caNotDimensionallyQualified" xlink:type="arc" order="62"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment_1997c2c3-bded-4d90-bda0-480424fa6636NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment_1997c2c3-bded-4d90-bda0-480424fa6636NotDimensionallyQualified" xlink:type="arc" order="63"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromGovernmentGrants_99984ef3-3265-4f9f-ad8b-33ba30b05ef7NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RevenueFromGovernmentGrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RevenueFromGovernmentGrants_99984ef3-3265-4f9f-ad8b-33ba30b05ef7NotDimensionallyQualified" xlink:type="arc" order="64"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ImpairmentOfNonCurrentAssetsHeldForSale_b8e81f11-2cf2-43fc-b3b5-1cc552bc2137NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ImpairmentOfNonCurrentAssetsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ImpairmentOfNonCurrentAssetsHeldForSale_b8e81f11-2cf2-43fc-b3b5-1cc552bc2137NotDimensionallyQualified" xlink:type="arc" order="65"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment_57915068-54e9-48b7-a474-d9f14c9ce084NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_GainsLossesOnDisposalsOfPropertyPlantAndEquipment_57915068-54e9-48b7-a474-d9f14c9ce084NotDimensionallyQualified" xlink:type="arc" order="66"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherOperatingIncomeExpense_8fbd2158-a35b-4f86-9fbf-f2a44175e82dNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherOperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherOperatingIncomeExpense_8fbd2158-a35b-4f86-9fbf-f2a44175e82dNotDimensionallyQualified" xlink:type="arc" order="67"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_SaleOfProjectsEfficiency_d240d537-edf5-4da7-9d31-3bf4593dc14dNotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_SaleOfProjectsEfficiency"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_SaleOfProjectsEfficiency_d240d537-edf5-4da7-9d31-3bf4593dc14dNotDimensionallyQualified" xlink:type="arc" order="68"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ResultFromTheLossOfControlOfConsolidatedInvestments_e3b39964-7945-4f4c-a894-3f9f82ab1458NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ResultFromTheLossOfControlOfConsolidatedInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ResultFromTheLossOfControlOfConsolidatedInvestments_e3b39964-7945-4f4c-a894-3f9f82ab1458NotDimensionallyQualified" xlink:type="arc" order="69"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_f3ed2e06-ec02-4401-b3a8-66656ef3f606NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_f3ed2e06-ec02-4401-b3a8-66656ef3f606NotDimensionallyQualified" xlink:type="arc" order="70"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncome_8a322cc1-5444-408c-aaa6-1dd1b9549239NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_FinanceIncome_8a322cc1-5444-408c-aaa6-1dd1b9549239NotDimensionallyQualified" xlink:type="arc" order="71"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts_e9bffe13-fdae-4c8c-a38f-27eea95437a3NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_FinanceCosts_e9bffe13-fdae-4c8c-a38f-27eea95437a3NotDimensionallyQualified" xlink:type="arc" order="72"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_7081452e-e249-415d-8167-3cd95c9ecea1NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_7081452e-e249-415d-8167-3cd95c9ecea1NotDimensionallyQualified" xlink:type="arc" order="73"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ChangeInFairValueOfFinancialInstruments_64bfeec3-b5f6-40f3-9623-b2475a681da6NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ChangeInFairValueOfFinancialInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ChangeInFairValueOfFinancialInstruments_64bfeec3-b5f6-40f3-9623-b2475a681da6NotDimensionallyQualified" xlink:type="arc" order="74"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ImpairmentAndGainsOrLossesOnDisposalsOfFinancialInstruments_e5fa5194-3e3b-4d00-a8ae-129a4f9fe2ceNotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ImpairmentAndGainsOrLossesOnDisposalsOfFinancialInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ImpairmentAndGainsOrLossesOnDisposalsOfFinancialInstruments_e5fa5194-3e3b-4d00-a8ae-129a4f9fe2ceNotDimensionallyQualified" xlink:type="arc" order="75"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceIncomeCost_89a1d59e-d86c-4505-92ab-33f9a0674dd4NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceIncomeCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_FinanceIncomeCost_89a1d59e-d86c-4505-92ab-33f9a0674dd4NotDimensionallyQualified" xlink:type="arc" order="76"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_3e3519e5-5a47-489e-8b99-85d3fc371380NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_3e3519e5-5a47-489e-8b99-85d3fc371380NotDimensionallyQualified" xlink:type="arc" order="77"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_bc72dd36-284a-4c8c-81a9-d833c87ff09bNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_bc72dd36-284a-4c8c-81a9-d833c87ff09bNotDimensionallyQualified" xlink:type="arc" order="78"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_da952aac-236c-4791-a9ac-48d2fc51c3b4NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_da952aac-236c-4791-a9ac-48d2fc51c3b4NotDimensionallyQualified" xlink:type="arc" order="79"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromContinuingOperations_9aa5d0fd-5a34-4666-a9d1-10d4b6211b2bNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossFromContinuingOperations_9aa5d0fd-5a34-4666-a9d1-10d4b6211b2bNotDimensionallyQualified" xlink:type="arc" order="80"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_efe1e39b-f4a1-46e8-984a-c71aff5afa8dNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLoss_efe1e39b-f4a1-46e8-984a-c71aff5afa8dNotDimensionallyQualified" xlink:type="arc" order="81"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent_bd421c46-acb1-416b-bd65-50be80965b68NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent_bd421c46-acb1-416b-bd65-50be80965b68NotDimensionallyQualified" xlink:type="arc" order="82"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_350188d0-c695-41e0-9eaf-31887d99b47cNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_350188d0-c695-41e0-9eaf-31887d99b47cNotDimensionallyQualified" xlink:type="arc" order="83"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BasicEarningsLossPerShare_90eaa666-f79a-4c1a-9564-ae0b115c3907NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BasicEarningsLossPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_BasicEarningsLossPerShare_90eaa666-f79a-4c1a-9564-ae0b115c3907NotDimensionallyQualified" xlink:type="arc" order="84"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BasicEarningsLossPerShareFromContinuingOperations_80aad7ff-48ce-4d13-9125-4e1711a0ce4fNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BasicEarningsLossPerShareFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_BasicEarningsLossPerShareFromContinuingOperations_80aad7ff-48ce-4d13-9125-4e1711a0ce4fNotDimensionallyQualified" xlink:type="arc" order="85"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DilutedEarningsLossPerShare_577224e7-f59f-48bf-af82-93d6f9f76620NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DilutedEarningsLossPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DilutedEarningsLossPerShare_577224e7-f59f-48bf-af82-93d6f9f76620NotDimensionallyQualified" xlink:type="arc" order="86"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DilutedEarningsLossPerShareFromContinuingOperations_b61dcc49-e3a2-49f5-bda6-0be301a4a51bNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DilutedEarningsLossPerShareFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DilutedEarningsLossPerShareFromContinuingOperations_b61dcc49-e3a2-49f5-bda6-0be301a4a51bNotDimensionallyQualified" xlink:type="arc" order="87"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_IncomeAndExpensesRecognizedInEquity_803f2138-37cc-4da5-a1a3-c6160ff5215bNotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_IncomeAndExpensesRecognizedInEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_IncomeAndExpensesRecognizedInEquity_803f2138-37cc-4da5-a1a3-c6160ff5215bNotDimensionallyQualified" xlink:type="arc" order="88"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax_6c13a82c-1434-46ba-b3e5-78049d4b5bafNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax_6c13a82c-1434-46ba-b3e5-78049d4b5bafNotDimensionallyQualified" xlink:type="arc" order="89"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax_5a404dc8-9987-4328-aa81-092e18db5be3NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax_5a404dc8-9987-4328-aa81-092e18db5be3NotDimensionallyQualified" xlink:type="arc" order="90"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss_5a15331d-cef9-4cbf-bb33-2c0e311ffc65NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss_5a15331d-cef9-4cbf-bb33-2c0e311ffc65NotDimensionallyQualified" xlink:type="arc" order="91"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax_27bccb72-e42d-49c3-9dfc-49e1551396f8NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax_27bccb72-e42d-49c3-9dfc-49e1551396f8NotDimensionallyQualified" xlink:type="arc" order="92"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax_bc9d1011-f9d8-4879-b674-d668902a0b69NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax_bc9d1011-f9d8-4879-b674-d668902a0b69NotDimensionallyQualified" xlink:type="arc" order="93"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_50ea62d3-0e49-4ce0-a433-57c72bb9e8e1NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_50ea62d3-0e49-4ce0-a433-57c72bb9e8e1NotDimensionallyQualified" xlink:type="arc" order="94"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax_6a4f4b40-2f92-4582-a439-781c191edd04NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax_6a4f4b40-2f92-4582-a439-781c191edd04NotDimensionallyQualified" xlink:type="arc" order="95"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome_ca126bf4-1e27-4099-9fd7-111fa7896ed0NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ComprehensiveIncome_ca126bf4-1e27-4099-9fd7-111fa7896ed0NotDimensionallyQualified" xlink:type="arc" order="96"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_a8b9149e-79ec-467e-8f28-1766d5b32006NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_a8b9149e-79ec-467e-8f28-1766d5b32006NotDimensionallyQualified" xlink:type="arc" order="97"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_daeb9640-8e9c-4a8d-8119-ef9209dab4afNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_daeb9640-8e9c-4a8d-8119-ef9209dab4afNotDimensionallyQualified" xlink:type="arc" order="98"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForReconcileProfitLoss_a6717743-2a35-48a6-b46d-787af919e315NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForReconcileProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForReconcileProfitLoss_a6717743-2a35-48a6-b46d-787af919e315NotDimensionallyQualified" xlink:type="arc" order="99"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_b6473df8-3886-498a-a77d-c99e3ebcf0b6NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_b6473df8-3886-498a-a77d-c99e3ebcf0b6NotDimensionallyQualified" xlink:type="arc" order="100"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_fc7c96c8-ac60-4ea5-a3c7-ef6ab304bf9aNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_fc7c96c8-ac60-4ea5-a3c7-ef6ab304bf9aNotDimensionallyQualified" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForProvisions_83600897-551b-4b72-8704-5f9825eda689NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForProvisions_83600897-551b-4b72-8704-5f9825eda689NotDimensionallyQualified" xlink:type="arc" order="102"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_AdjustmentsForWorkOnTheCompanyFixedAssets_cfd1ee46-d5e3-4c35-8fd7-72717e6a0c44NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_AdjustmentsForWorkOnTheCompanyFixedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_AdjustmentsForWorkOnTheCompanyFixedAssets_cfd1ee46-d5e3-4c35-8fd7-72717e6a0c44NotDimensionallyQualified" xlink:type="arc" order="103"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_AdjustmentsForAllocationOfGrants_667c8e48-f8f0-4420-a753-5726d4b1c0fdNotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_AdjustmentsForAllocationOfGrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_AdjustmentsForAllocationOfGrants_667c8e48-f8f0-4420-a753-5726d4b1c0fdNotDimensionallyQualified" xlink:type="arc" order="104"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets_d48c486c-50c6-4e26-9fb0-57e794109eafNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets_d48c486c-50c6-4e26-9fb0-57e794109eafNotDimensionallyQualified" xlink:type="arc" order="105"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFinanceIncome_fb68a2d1-466b-47a2-9cab-b0dba81cd67eNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForFinanceIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForFinanceIncome_fb68a2d1-466b-47a2-9cab-b0dba81cd67eNotDimensionallyQualified" xlink:type="arc" order="106"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFinanceIncomeCost_c42f320f-261c-4bee-9b17-efc49e0adb8cNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForFinanceIncomeCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForFinanceIncomeCost_c42f320f-261c-4bee-9b17-efc49e0adb8cNotDimensionallyQualified" xlink:type="arc" order="107"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains_95fed0c3-50b7-4f8c-9dc6-4e23599c1fb5NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForUnrealisedForeignExchangeLossesGains_95fed0c3-50b7-4f8c-9dc6-4e23599c1fb5NotDimensionallyQualified" xlink:type="arc" order="108"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFairValueGainsLosses_4907878d-fa7e-4f89-a4b8-7aae1983dafaNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForFairValueGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForFairValueGainsLosses_4907878d-fa7e-4f89-a4b8-7aae1983dafaNotDimensionallyQualified" xlink:type="arc" order="109"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProfitLossOnDisposalOfFinancialInvestments_6382a83b-0805-43b4-a4c3-f40b997b1f1aNotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProfitLossOnDisposalOfFinancialInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ProfitLossOnDisposalOfFinancialInvestments_6382a83b-0805-43b4-a4c3-f40b997b1f1aNotDimensionallyQualified" xlink:type="arc" order="110"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_438e0d6f-cd14-45b9-abf3-4217fce088b2NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_438e0d6f-cd14-45b9-abf3-4217fce088b2NotDimensionallyQualified" xlink:type="arc" order="111"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherAdjustmentsToReconcileProfitLoss_68e6591c-aee4-466a-b602-2f668fc498f7NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherAdjustmentsToReconcileProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherAdjustmentsToReconcileProfitLoss_68e6591c-aee4-466a-b602-2f668fc498f7NotDimensionallyQualified" xlink:type="arc" order="112"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInWorkingCapital_69a4b9a4-0b29-4bce-9843-c9c9d6205721NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInWorkingCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseInWorkingCapital_69a4b9a4-0b29-4bce-9843-c9c9d6205721NotDimensionallyQualified" xlink:type="arc" order="113"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_ef2d90b0-523f-4a62-9fbc-6b99a407b22dNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_ef2d90b0-523f-4a62-9fbc-6b99a407b22dNotDimensionallyQualified" xlink:type="arc" order="114"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_c6a415f3-85a4-45b9-b968-2b4e241d303eNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_c6a415f3-85a4-45b9-b968-2b4e241d303eNotDimensionallyQualified" xlink:type="arc" order="115"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets_5bb8b038-c635-4ab6-b5aa-fbf3e449584eNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets_5bb8b038-c635-4ab6-b5aa-fbf3e449584eNotDimensionallyQualified" xlink:type="arc" order="116"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_560b0287-d93e-4d97-ade6-d6f572b088d2NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_560b0287-d93e-4d97-ade6-d6f572b088d2NotDimensionallyQualified" xlink:type="arc" order="117"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherCurrentLiabilities_9f3e732e-958e-41d1-b185-5596b5193d6dNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInOtherCurrentLiabilities_9f3e732e-958e-41d1-b185-5596b5193d6dNotDimensionallyQualified" xlink:type="arc" order="118"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities_65c253b5-f3e4-4eed-bfcb-736d900a72b5NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities_65c253b5-f3e4-4eed-bfcb-736d900a72b5NotDimensionallyQualified" xlink:type="arc" order="119"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities_3888690c-f5c1-403f-babc-ea8683284300NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities_3888690c-f5c1-403f-babc-ea8683284300NotDimensionallyQualified" xlink:type="arc" order="120"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_8c3b43ec-40ff-4a96-86db-c30ee4957a01NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_8c3b43ec-40ff-4a96-86db-c30ee4957a01NotDimensionallyQualified" xlink:type="arc" order="121"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_30e8ef83-7911-4e94-9d9e-84518d9bd4a7NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_30e8ef83-7911-4e94-9d9e-84518d9bd4a7NotDimensionallyQualified" xlink:type="arc" order="122"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OutflowsOfCashFromInvestingActivities_1c8f2934-9407-4dbd-bf6d-066a6a3d2612NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OutflowsOfCashFromInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OutflowsOfCashFromInvestingActivities_1c8f2934-9407-4dbd-bf6d-066a6a3d2612NotDimensionallyQualified" xlink:type="arc" order="123"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_0e4bf89e-ecad-4959-afdd-3377c350d724NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_0e4bf89e-ecad-4959-afdd-3377c350d724NotDimensionallyQualified" xlink:type="arc" order="124"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_142881a7-12fc-4385-a829-c1b66ebc6b50NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_142881a7-12fc-4385-a829-c1b66ebc6b50NotDimensionallyQualified" xlink:type="arc" order="125"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InflowsOfCashFromInvestingActivities_b4ae8374-e62d-4c96-af53-250e53d62c98NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InflowsOfCashFromInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InflowsOfCashFromInvestingActivities_b4ae8374-e62d-4c96-af53-250e53d62c98NotDimensionallyQualified" xlink:type="arc" order="126"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_5784057a-4f50-411e-bc25-1725947bf6e2NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_5784057a-4f50-411e-bc25-1725947bf6e2NotDimensionallyQualified" xlink:type="arc" order="127"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProceedsFromOtherFinancialAssetsClassifiedAsInvestingActivities_f7f012e0-10d8-450e-9064-0adce339f822NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProceedsFromOtherFinancialAssetsClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ProceedsFromOtherFinancialAssetsClassifiedAsInvestingActivities_f7f012e0-10d8-450e-9064-0adce339f822NotDimensionallyQualified" xlink:type="arc" order="128"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_1cc79186-2b4a-4dc9-8abd-44411966ee7aNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_1cc79186-2b4a-4dc9-8abd-44411966ee7aNotDimensionallyQualified" xlink:type="arc" order="129"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProceedsFromAndPaymentsOnEquityInstruments_e5cd100e-2d72-40cf-b0ab-f9015a840aa1NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProceedsFromAndPaymentsOnEquityInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ProceedsFromAndPaymentsOnEquityInstruments_e5cd100e-2d72-40cf-b0ab-f9015a840aa1NotDimensionallyQualified" xlink:type="arc" order="130"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProceedsAndPaymentsFromFinancialLiabilities_416d01bf-1b7d-46d8-bcaa-eb31c64877b4NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProceedsAndPaymentsFromFinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ProceedsAndPaymentsFromFinancialLiabilities_416d01bf-1b7d-46d8-bcaa-eb31c64877b4NotDimensionallyQualified" xlink:type="arc" order="131"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProceedsFrom_6dfa93f2-e2ae-4954-bb5f-2edd5add9c04NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProceedsFrom"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_ProceedsFrom_6dfa93f2-e2ae-4954-bb5f-2edd5add9c04NotDimensionallyQualified" xlink:type="arc" order="132"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_7e300fb4-58b0-4049-a561-55a5897d4393NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_7e300fb4-58b0-4049-a561-55a5897d4393NotDimensionallyQualified" xlink:type="arc" order="133"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_InflowsFromDebtsWithPartnersClassifiedAsFinancingActivities_e7fed073-3078-4653-bbd3-9fee1c0460f2NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_InflowsFromDebtsWithPartnersClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_InflowsFromDebtsWithPartnersClassifiedAsFinancingActivities_e7fed073-3078-4653-bbd3-9fee1c0460f2NotDimensionallyQualified" xlink:type="arc" order="134"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_InflowsFromPublicAdministrationsClassifiedAsFinancingActivities_52264993-4633-46f1-a6b6-2ac2da022786NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_InflowsFromPublicAdministrationsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_InflowsFromPublicAdministrationsClassifiedAsFinancingActivities_52264993-4633-46f1-a6b6-2ac2da022786NotDimensionallyQualified" xlink:type="arc" order="135"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_RepaymentAndAmortisation_a469d596-345b-4516-b6ea-e86e1644312dNotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_RepaymentAndAmortisation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_RepaymentAndAmortisation_a469d596-345b-4516-b6ea-e86e1644312dNotDimensionallyQualified" xlink:type="arc" order="136"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_edeb4542-d9e6-4ad9-90f4-7eeaf80815f4NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_edeb4542-d9e6-4ad9-90f4-7eeaf80815f4NotDimensionallyQualified" xlink:type="arc" order="137"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_OutflowsFromDebtsWithPartnersClassifiedAsFinancingActivities_db7832b2-a23b-40b3-9bce-4aa841959681NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_OutflowsFromDebtsWithPartnersClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_OutflowsFromDebtsWithPartnersClassifiedAsFinancingActivities_db7832b2-a23b-40b3-9bce-4aa841959681NotDimensionallyQualified" xlink:type="arc" order="138"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_OutflowsFromPublicAdministrationsClassifiedAsFinancingActivities_d46f03c8-368a-4213-ad13-e2fda3325b10NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_OutflowsFromPublicAdministrationsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_OutflowsFromPublicAdministrationsClassifiedAsFinancingActivities_d46f03c8-368a-4213-ad13-e2fda3325b10NotDimensionallyQualified" xlink:type="arc" order="139"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_90404b8d-7195-4449-891f-3b4133f180ecNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_90404b8d-7195-4449-891f-3b4133f180ecNotDimensionallyQualified" xlink:type="arc" order="140"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_47e39cbc-e791-4a77-88ec-03596e9e98d3NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_47e39cbc-e791-4a77-88ec-03596e9e98d3NotDimensionallyQualified" xlink:type="arc" order="141"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_69a58857-5caf-4027-98ab-153c16d1ff0bNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_69a58857-5caf-4027-98ab-153c16d1ff0bNotDimensionallyQualified" xlink:type="arc" order="142"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory_d17c0ace-5b4d-46c6-bbe3-4328bb9927f3NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory_d17c0ace-5b4d-46c6-bbe3-4328bb9927f3NotDimensionallyQualified" xlink:type="arc" order="143"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory_a5d86a6d-844e-4354-8bde-7ae121eb03bbNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory_a5d86a6d-844e-4354-8bde-7ae121eb03bbNotDimensionallyQualified" xlink:type="arc" order="144"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory_708788ce-e7dd-4141-a44b-4c6a6ad390ceNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory_708788ce-e7dd-4141-a44b-4c6a6ad390ceNotDimensionallyQualified" xlink:type="arc" order="145"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_64821e0a-d804-4504-880f-af6890d97109NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfFinancialRiskManagementExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_64821e0a-d804-4504-880f-af6890d97109NotDimensionallyQualified" xlink:type="arc" order="146"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_6b13c119-18ef-4d6c-bd4e-e84d6121a31dNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_6b13c119-18ef-4d6c-bd4e-e84d6121a31dNotDimensionallyQualified" xlink:type="arc" order="147"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory_a31e99e8-1622-4fa5-8fa2-24e96e5d3083NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory_a31e99e8-1622-4fa5-8fa2-24e96e5d3083NotDimensionallyQualified" xlink:type="arc" order="148"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_c843aa04-7548-425d-a4c2-d31752c9aab1NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory_c843aa04-7548-425d-a4c2-d31752c9aab1NotDimensionallyQualified" xlink:type="arc" order="149"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory_dd92f2f8-bf58-4cbb-b84c-99ed911c05c2NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory_dd92f2f8-bf58-4cbb-b84c-99ed911c05c2NotDimensionallyQualified" xlink:type="arc" order="150"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_2ae55420-d630-4960-8e3c-3cb3fc6c3ddcNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfFinancialInstrumentsExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_2ae55420-d630-4960-8e3c-3cb3fc6c3ddcNotDimensionallyQualified" xlink:type="arc" order="151"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInventoriesExplanatory_c4282c67-5cad-4221-8752-f59862e0786fNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfInventoriesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInventoriesExplanatory_c4282c67-5cad-4221-8752-f59862e0786fNotDimensionallyQualified" xlink:type="arc" order="152"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_728be33f-28be-4a28-902d-c30081eab2e3NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_728be33f-28be-4a28-902d-c30081eab2e3NotDimensionallyQualified" xlink:type="arc" order="153"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory_33966ec6-f6fa-47e0-bb88-71d9c71cf519NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory_33966ec6-f6fa-47e0-bb88-71d9c71cf519NotDimensionallyQualified" xlink:type="arc" order="154"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory_423caed4-984f-4aed-adfb-2b95193fadfdNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfOtherLiabilitiesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory_423caed4-984f-4aed-adfb-2b95193fadfdNotDimensionallyQualified" xlink:type="arc" order="155"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_DisclosureOfFiscalSituationTextBlock_ca921536-e710-4d5d-b410-1e14f6f39499NotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_DisclosureOfFiscalSituationTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_DisclosureOfFiscalSituationTextBlock_ca921536-e710-4d5d-b410-1e14f6f39499NotDimensionallyQualified" xlink:type="arc" order="156"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory_ed4a6e89-ace4-47f4-ba76-63f5adc5f7d6NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfRelatedPartyExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory_ed4a6e89-ace4-47f4-ba76-63f5adc5f7d6NotDimensionallyQualified" xlink:type="arc" order="157"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_DisclosureOfRevenueAndExpensesExplanatoryTextBlock_c51b63c0-385f-4486-8302-799d487d739fNotDimensionallyQualified" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_DisclosureOfRevenueAndExpensesExplanatoryTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_airtificial_DisclosureOfRevenueAndExpensesExplanatoryTextBlock_c51b63c0-385f-4486-8302-799d487d739fNotDimensionallyQualified" xlink:type="arc" order="158"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAdditionalInformationExplanatory_b752313f-04b1-4d86-9bfc-f0dbc732f7cbNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfAdditionalInformationExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfAdditionalInformationExplanatory_b752313f-04b1-4d86-9bfc-f0dbc732f7cbNotDimensionallyQualified" xlink:type="arc" order="159"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesExplanatory_4e9fd0eb-3509-42fc-be5a-d2eb9d50e4aeNotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfJointVenturesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfJointVenturesExplanatory_4e9fd0eb-3509-42fc-be5a-d2eb9d50e4aeNotDimensionallyQualified" xlink:type="arc" order="160"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_b306e050-7b78-46ab-936f-070d669968c6NotDimensionallyQualified" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_b306e050-7b78-46ab-936f-070d669968c6NotDimensionallyQualified" xlink:type="arc" order="161"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.airtificial.com/role/Anchoring" xlink:type="simple" xlink:href="95980020140005635004-2021-12-31.xsd#Anchoring"/>
  <link:definitionLink xlink:role="http://www.airtificial.com/role/Anchoring" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_AdjustmentsForAllocationOfGrants_028f634b-09b1-4d2b-86aa-7b8fbb6d7367" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_AdjustmentsForAllocationOfGrants"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital" xlink:to="loc_airtificial_AdjustmentsForAllocationOfGrants_028f634b-09b1-4d2b-86aa-7b8fbb6d7367" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities_1c909dde-2d2e-4c5d-9b89-80e99f81fc03" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInOtherCurrentAssets" xlink:to="loc_airtificial_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssetsAndLiabilities_1c909dde-2d2e-4c5d-9b89-80e99f81fc03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_AdjustmentsForWorkOnTheCompanyFixedAssets_57f8e098-c434-43b3-ad04-503c67a0c55f" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_AdjustmentsForWorkOnTheCompanyFixedAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:to="loc_airtificial_AdjustmentsForWorkOnTheCompanyFixedAssets_57f8e098-c434-43b3-ad04-503c67a0c55f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ChangeInFairValueOfFinancialInstruments_4536cbb2-fe77-4bd9-a21c-551f6f25b174" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ChangeInFairValueOfFinancialInstruments"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_ProfitLossBeforeTax" xlink:to="loc_airtificial_ChangeInFairValueOfFinancialInstruments_4536cbb2-fe77-4bd9-a21c-551f6f25b174" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_CreditCompensation_5b1d7865-c437-4db3-bfe8-78a6a00306c4" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_CreditCompensation"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_Equity" xlink:to="loc_airtificial_CreditCompensation_5b1d7865-c437-4db3-bfe8-78a6a00306c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_CurrentReceivablesAndOtherAssets_58a65cff-5d9a-4b13-afc1-6f123bcc278a" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_CurrentReceivablesAndOtherAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentReceivables"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_TradeAndOtherCurrentReceivables" xlink:to="loc_airtificial_CurrentReceivablesAndOtherAssets_58a65cff-5d9a-4b13-afc1-6f123bcc278a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_DisclosureOfFiscalSituationTextBlock_5573b590-a165-4ce8-8a79-e04df213e091" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_DisclosureOfFiscalSituationTextBlock"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory" xlink:to="loc_airtificial_DisclosureOfFiscalSituationTextBlock_5573b590-a165-4ce8-8a79-e04df213e091" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_DisclosureOfRevenueAndExpensesExplanatoryTextBlock_af76e0d5-c2d1-474e-9d08-b2657309b3fa" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_DisclosureOfRevenueAndExpensesExplanatoryTextBlock"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_DisclosureOfNotesAndOtherExplanatoryInformationExplanatory" xlink:to="loc_airtificial_DisclosureOfRevenueAndExpensesExplanatoryTextBlock_af76e0d5-c2d1-474e-9d08-b2657309b3fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRevenueExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfRevenueExplanatory"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_airtificial_DisclosureOfRevenueAndExpensesExplanatoryTextBlock_af76e0d5-c2d1-474e-9d08-b2657309b3fa" xlink:to="loc_ifrs-full_DisclosureOfRevenueExplanatory" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfExpensesExplanatory" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DisclosureOfExpensesExplanatory"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_airtificial_DisclosureOfRevenueAndExpensesExplanatoryTextBlock_af76e0d5-c2d1-474e-9d08-b2657309b3fa" xlink:to="loc_ifrs-full_DisclosureOfExpensesExplanatory" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ImpairmentAndGainsOrLossesOnDisposalsOfFinancialInstruments_b2ff713b-cc03-4493-8c96-67cb9a731d24" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ImpairmentAndGainsOrLossesOnDisposalsOfFinancialInstruments"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_ProfitLossBeforeTax" xlink:to="loc_airtificial_ImpairmentAndGainsOrLossesOnDisposalsOfFinancialInstruments_b2ff713b-cc03-4493-8c96-67cb9a731d24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ImpairmentOfNonCurrentAssetsHeldForSale_12215238-b380-43a7-a6ec-fa7601b9ab53" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ImpairmentOfNonCurrentAssetsHeldForSale"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherOperatingIncomeExpense" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherOperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherOperatingIncomeExpense" xlink:to="loc_airtificial_ImpairmentOfNonCurrentAssetsHeldForSale_12215238-b380-43a7-a6ec-fa7601b9ab53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_IncomeAndExpensesRecognizedInEquity_a517f755-f3bf-45c4-a154-d4bc3a40ac01" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_IncomeAndExpensesRecognizedInEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="loc_airtificial_IncomeAndExpensesRecognizedInEquity_a517f755-f3bf-45c4-a154-d4bc3a40ac01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_InflowsFromDebtsWithPartnersClassifiedAsFinancingActivities_3eaf9ed5-309a-4333-927d-88baecec7cfb" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_InflowsFromDebtsWithPartnersClassifiedAsFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:to="loc_airtificial_InflowsFromDebtsWithPartnersClassifiedAsFinancingActivities_3eaf9ed5-309a-4333-927d-88baecec7cfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_InflowsFromPublicAdministrationsClassifiedAsFinancingActivities_9c7bbc88-f1e5-42db-81e0-a1a6fda51b61" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_InflowsFromPublicAdministrationsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:to="loc_airtificial_InflowsFromPublicAdministrationsClassifiedAsFinancingActivities_9c7bbc88-f1e5-42db-81e0-a1a6fda51b61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_LiabilitiesForPurchasesOrProvisionOfServices_0e82d396-0bb4-4ea1-b699-30741df1de5b" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_LiabilitiesForPurchasesOrProvisionOfServices"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherCurrentLiabilities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherCurrentLiabilities" xlink:to="loc_airtificial_LiabilitiesForPurchasesOrProvisionOfServices_0e82d396-0bb4-4ea1-b699-30741df1de5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_OutflowsFromDebtsWithPartnersClassifiedAsFinancingActivities_2aec4ae7-77a9-45e6-a33e-554c2cbedd26" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_OutflowsFromDebtsWithPartnersClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:to="loc_airtificial_OutflowsFromDebtsWithPartnersClassifiedAsFinancingActivities_2aec4ae7-77a9-45e6-a33e-554c2cbedd26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_OutflowsFromPublicAdministrationsClassifiedAsFinancingActivities_49675f4f-b0ac-4a27-9f66-099bd14fde29" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_OutflowsFromPublicAdministrationsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:to="loc_airtificial_OutflowsFromPublicAdministrationsClassifiedAsFinancingActivities_49675f4f-b0ac-4a27-9f66-099bd14fde29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProceedsFrom_b94276f3-8fe8-4e84-914b-c169bdcded72" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProceedsFrom"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:to="loc_airtificial_ProceedsFrom_b94276f3-8fe8-4e84-914b-c169bdcded72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProceedsFromAndPaymentsOnEquityInstruments_ef6c04f6-14bb-46ee-a26e-f4ab0b5973f0" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProceedsFromAndPaymentsOnEquityInstruments"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="loc_airtificial_ProceedsFromAndPaymentsOnEquityInstruments_ef6c04f6-14bb-46ee-a26e-f4ab0b5973f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProceedsFromOtherFinancialAssetsClassifiedAsInvestingActivities_6a0b5301-02bd-4054-b52a-285eeea2dee9" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProceedsFromOtherFinancialAssetsClassifiedAsInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:to="loc_airtificial_ProceedsFromOtherFinancialAssetsClassifiedAsInvestingActivities_6a0b5301-02bd-4054-b52a-285eeea2dee9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ProfitLossOnDisposalOfFinancialInvestments_c16b5239-535c-4e07-803e-c0745fa1cfa6" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ProfitLossOnDisposalOfFinancialInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="loc_airtificial_ProfitLossOnDisposalOfFinancialInvestments_c16b5239-535c-4e07-803e-c0745fa1cfa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_RepaymentAndAmortisation_fe611b83-644b-4302-92e3-0610af8ff889" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_RepaymentAndAmortisation"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:to="loc_airtificial_RepaymentAndAmortisation_fe611b83-644b-4302-92e3-0610af8ff889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ReservesOfTheParentCompany_1ab89c1c-9e89-4a47-b509-2dffa9960a86" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ReservesOfTheParentCompany"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherReserves" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherReserves"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherReserves" xlink:to="loc_airtificial_ReservesOfTheParentCompany_1ab89c1c-9e89-4a47-b509-2dffa9960a86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_ResultFromTheLossOfControlOfConsolidatedInvestments_20c55c41-8f4a-4c38-befe-4550be424d05" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_ResultFromTheLossOfControlOfConsolidatedInvestments"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherIncomeExpenseFromSubsidiariesJointlyControlledEntitiesAndAssociates" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherIncomeExpenseFromSubsidiariesJointlyControlledEntitiesAndAssociates"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherIncomeExpenseFromSubsidiariesJointlyControlledEntitiesAndAssociates" xlink:to="loc_airtificial_ResultFromTheLossOfControlOfConsolidatedInvestments_20c55c41-8f4a-4c38-befe-4550be424d05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_SaleOfProjectsEfficiency_8bb2a8d8-71d5-4f0b-a837-2ebe01bd93c6" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_SaleOfProjectsEfficiency"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherIncome" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherIncome"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherIncome" xlink:to="loc_airtificial_SaleOfProjectsEfficiency_8bb2a8d8-71d5-4f0b-a837-2ebe01bd93c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_airtificial_TaxReceivables_d1a21060-3b57-42d6-aa8f-ddba4a9668f6" xlink:href="95980020140005635004-2021-12-31.xsd#airtificial_TaxReceivables"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherNoncurrentReceivables" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentReceivables"/>
    <link:definitionArc xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="loc_ifrs-full_OtherNoncurrentReceivables" xlink:to="loc_airtificial_TaxReceivables_d1a21060-3b57-42d6-aa8f-ddba4a9668f6" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
