basement /ˈbeɪsmənt/noun 4forms 1phrases 1 noun4 •a floor or room of a building that is under the ground •Ellipsis of semi-basement, a floor mostly below grade •(informal) Last place in a sports conference's standings. •A mass of igneous or metamorphic rock forming the foundation over which a platform of sedimentary rocks is laid. formsbasements Phrases with basement basement battlerA team in or around the relegation zone.
