'adult' definitions:

Definition of 'adult'

(from WordNet)
adjective
(of animals) fully developed; "an adult animal"; "a grown woman" [syn: adult, big, full-grown, fully grown, grown, grownup]
adjective
Designed to arouse lust; "pornographic films and magazines"; "adult movies" [syn: pornographic, adult]
noun
A fully developed person from maturity onward [syn: adult, grownup] [ant: juvenile, juvenile person]
noun
Any mature animal

Synonyms of 'adult'

From: Moby Thesaurus