- noun the lowest level of rock, which has been covered by sediment
- The bottom full story of a building below the first floor. A basement may be partially or completely below grade.
- noun a section of a shop which is underground
- noun the part of a building which lies below ground level
- noun a storey of a building that is wholly or partly below ground level
- noun the foundation, substructure or lowest part of a wall or building
- noun an underground section of a building