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The definition of an adult is a person who is fully grown or is 18 years of age or older, as specified by the law.

(noun)

A 20 year old person is an example of an adult.

Adult is defined as grown up or something intended for a mature audience or of a mature nature.

(adjective)

A film that is rated NC-17 is an example of an adult movie.

See adult in Webster's New World College Dictionary

adjective

grown up; mature in age, size, strength, etc.
of or for adult persons: an adult novel
containing or providing pornography: adult movies

Origin: L adultus, pp. of adolescere: see adolescent

noun

a man or woman who is fully grown up; mature person
an animal or plant that is fully developed
a person who has reached the age of majority, now generally 18 years

Related Forms:

adulthood noun
adultness noun

See adult in American Heritage Dictionary 4

noun

One who has attained maturity or legal age.
Biology A fully grown, mature organism.

adjective

Fully developed and mature.
Relating to, intended for, or befitting adults: adult education.
Containing or dealing in explicitly sexual material; pornographic: adult movies; adult bookstores.

Origin:

Origin: From Latin adultus

Origin: , past participle of adolēscere, to grow up; see adolescent

Related Forms:

a·dultˈhoodˌ noun

a·dultˈness noun

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