condominium UK /ˌkɒn.dəˈmɪn.ɪ.əm/US /ˌkɑn.dəˈmɪn.i.əm/ noun6 •(US, Canada) A building or complex of buildings that provides multiple residential units each of which is owned separately but whose grounds, structure, etc. (if any) are owned jointly. •(US, Canada) An individual unit (such as an apartment) in such a complex. •(US, Canada) The system of ownership by which such condominiums operate. •(US, Canada) The legal tenure involved. •Joint sovereignty over a territory by two or more countries.The Anglo-Egyptian Sudan was a condominium ruled jointly by Egypt and the United Kingdom. •A region or territory under such rule. formscondominia · condominiums