condominiumcon·do·min·i·um /ˌkɒndəˈmɪniəmˌkɑːn-/ (also condo /ˈkɒndəʊˈkɑːndoʊ/) noun [countableC] American EnglishAmEPROPERTY an apartment in a building with several apartments, each of which is owned by the people living in it, or the apartment building itself