Definitions
1.nounA complete domicile occupying only part of a building, especially one for rent; a flat.
2.nounA suite of rooms within a domicile, designated for a specific person or persons and including a bedroom.
3.nounA division of an enclosure that is separate from others; a compartment
4.noun(COM) A conceptual space used for separation in the threading architecture. Objects in one apartment cannot directly access those in another, but must use a proxy.