Definitions from Wiktionary ( )

▸ noun:  A fully grown human or other animal.
▸ noun:  A person who has reached the legal age of majority.
▸ adjective:  Fully grown.
▸ adjective:  Intended for or restricted to adults rather than children due to size, maturity, knowledge level, judgement, etc.
▸ adjective:  Containing situations or discussions intended primarily for adults, such as serious crime, illicit drug use, extramarital affairs, etc.
▸ adjective:  (of a beverage) Containing alcohol, intended for consumption only by adults.
▸ adjective:  (of a cookie, gummy, etc.) Containing marijuana, intended for consumption only by adults.
▸ adjective:  Containing material of an explicit sexual nature; pornographic.
▸ adjective:  Containing excessive vulgar or profane speech, text or images, intended only for adults.
▸ verb:  (intransitive, slang) To behave like an adult.
▸ verb:  (nonstandard, rare) To (cause to) be or become an adult.

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