What does apartment mean?
The definition of apartment
A*part”ment, n.
Etym: [F. appartement; cf. It. appartamento, fr. appartare to separate, set apart; all fr. L. ad + pars, partis, part. See Apart.]

1 A room in a building; a division in a house, separated from others by partitions. Fielding.
2 A set or suite of rooms. De Quincey.
3 A compartment. [Obs.] Pope.