adult

An animal that is full-grown.

The young not only differs from the adult by the presence of its gills, but its feet are only developed by degrees, and in several genera there are also a deciduous beak and tail, and intestines of a different form

A person who has reached the legal age of majority.

Fully grown.

an adult human, animal, or plant

The paws of the adult brown bear, and also their hams, especially when smoked, are considered a great delicacy.

Intended for or restricted to adults rather than children due to size, maturity, knowledge level, judgement, etc.

adult clothes; adult cereal; an adult documentary

In May 1967 the WGBH Education Division submitted an initial proposal to HUD for a series of four adult television documentaries on conservation in an urban environment.

Intended for or restricted to adults rather than children due to size, maturity, knowledge level, judgement, etc.

adult situations; adult discussions

Intended for or restricted to adults rather than children due to size, maturity, knowledge level, judgement, etc.

an adult drink; an adult root beer float

Intended for or restricted to adults rather than children due to size, maturity, knowledge level, judgement, etc.

an adult cookie; adult gummy worms

To behave like an adult.

Adulting is hard!

To (cause to) be or become an adult.

Womanhood was achieved at twenty-one, when the female was "adulted"; manhood was fully achieved at twenty-five, […]

The process of adulting children[…] overlaps with the process of the uncontrolled infiltration of the media[…] into children’s imagination.