apartment

noun

1. (Australia, Canada, Philippines, US)A complete domicile occupying only part of a building, especially one for rent; a flat.

   “apartment dwellers”

   “I am Jonathan. I am in apartment B4. — I am in apartment C2.”

2. (archaic)A suite of rooms within a domicile, designated for a specific person or persons and including a bedroom.

   “By this contrivance I got into the inmost court; and, lying down upon my side, I applied my face to the windows of the middle stories, which were left open on purpose, and discovered the most splendid apartments that can be imagined. There I saw the empress and the young princes in their several lodgings, with their chief attendants about them.”

3. A room within a house.

   “For the matter of that, it is difficult to make a nice, genteel sitting-room out of an apartment of which the principal features are a sink and a big gas stove.”

4. (obsolete)A division of an enclosure that is separate from others; a compartment.
5. 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.