semi-detached ˌsemi-deˈtached /ˌsem.i.dɪˈtætʃt/ adjectiveUK ► C1 A house that is semi-detached is one that is joined to another similar house on only one side: » They live in a semi-detached house.→COMPAREDETACHED(Cf. ↑detached) (SEPARATE)Thesaurus+: ↑Houses and homes