Chiefly in plural. Each of a number of separate dwelling places or apartments in a large house, group of buildings, etc. Also in extended use. Now…

spec. In England, A portion of a house, tenanted as a separate dwelling; a flat; a suite of apartments, or even a single room so let or occupied.

A portion of a house or building, consisting of a suite or set of rooms, allotted to the use of a particular person or party. archaic.

A suite of rooms on one floor, forming a complete residence. first, second,etc. flat: a suite on the first, second, etc. floor. In recent use, not…

The portion of a building, consisting of one or more rooms, occupied by one tenant or family. In later use chiefly Scottish: a dwelling that is one…

†(a) a basement storey (obsolete); (b) (chiefly British) a basement, or part of a basement, used as a complete residence.

Chiefly in classified advertisements: an apartment; (also) apartments.

a flat or apartment, usually one owned by the occupant.

An apartment or other residence on three floors. Chiefly U.S.

a self-contained section or unit intended for separate occupation in a building or group of buildings.