partnernounmasculine/ˈsɔ.si.u/mediumsó·ci·oPortuguesEnglishEspanolFrancaisDefinitionA person who is a member of a partnership or association.He has been a partner in the firm for five years.The partners decided to increase the capital.synmemberassociateEtymologyDo latim 'socius'Related wordssociologiasociávelsociopata