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.
From French adulte, from Latin adultus (“grown up”), perfect passive participle of adolescō (“I grow up”). Compare adolescent.
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Intended for or restricted to adults rather than children due to size, maturity, knowledge level, judgement, etc.
adult clothes; adult cereal; an adult documentary