semi-detached adjective 1noun 1forms 1 adjective1 •Of a house: joined to another one on one side, having one shared wall.In the smaller plans of a "Mansionette near Wimbledon Park," "Semi-detached Houses," and "The Compact House built near Blackheath," we are not favoured with any scale. — 1860 noun1 •Such a house. formssemi-detacheds
