From The Collaborative International Dictionary of English v.0.48 [gcide]:
Occupant \Oc"cu*pant\, n. [L. occupans, p. pr. of occupare: cf.
F. occupant. See Occupy.]
1. One who occupies, or takes possession; one who has the
actual use or possession, or is in possession, of a thing;
as, the occupant of the apartment is not at home.
[1913 Webster]
Note: This word, in law, sometimes signifies one who takes
the first possession of a thing that has no owner.
[1913 Webster]
2. A prostitute. [Obs.] --Marston.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
occupant
n 1: someone who lives at a particular place for a prolonged
period or who was born there [syn: resident, occupant,
occupier] [ant: nonresident]