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having attained full size and strength; grown up; mature:
an adult person, animal, or plant.
of, relating to, or befitting adults.
intended for adults; not suitable for children:
adult entertainment.
a person who is fully grown or developed or of age.
a full-grown animal or plant.
a person who has attained the age of maturity as specified by law.
Contemporary Examples

Some sufferers will die in childhood, but the majority with this type will live to adulthood.
‘Bucket List’ Baby Avery Canahuati: Facts About Spinal Muscular Atrophy Andrew Carter May 2, 2012

Below is a list of locations where I resided from childhood to adulthood.
Rogue L.A. Cop’s Facebook Manifesto: ‘You Will Now Live the Life of Prey’ The Daily Beast February 7, 2013

A basketball player in her teen years, Goldberg became a veteran of various exercise fads in adulthood.
Breaking Polo’s Grass Ceiling Keli Goff August 19, 2014

The moral duties and doubts of adulthood are swapped out for the histrionic creeds of adolescence.
Two New Films Preach Our Nation’s Corrosive Gridiron Gospel Steve Almond September 19, 2014

Let Me In is definitely about that particular chasm between childhood and adulthood.
Let Me In Is the Anti-Twilight Jace Lacob September 28, 2010

Historical Examples

We treat it simply as a privation because we are measuring it by adulthood as a fixed standard.
Democracy and Education John Dewey

Dreams of adulthood, dealing with the present or the future, indicate progression.
Psychoanalysis Andr Tridon

This is most inconsiderate, and naturally leads to a corresponding disrespect for adulthood on the part of the child.
Dickens As an Educator James L. (James Laughlin) Hughes

It leads, too, in due time, to a lack of reverence for adulthood.
Dickens As an Educator James L. (James Laughlin) Hughes

Oh, to be out of school, at the end of that first day of adulthood!
The Madigans Miriam Michelson

adjective
having reached maturity; fully developed
of or intended for mature people: adult education
regarded as suitable only for adults, because of being pornographic: adult films and magazines
noun
a person who has attained maturity; a grownup
a mature fully grown animal or plant
(law) a person who has attained the age of legal majority (18 years for most purposes) Compare infant
n.

1850, from adult + -hood.
adj.

1530s (but not common until mid-17c.), from Latin adultus “grown up, mature, adult, ripe,” past participle of adolescere “grow up, mature” (see adolescent). As a euphemism for “pornographic,” it dates to 1958 and does no honor to the word.
n.

“adult person,” 1650s, from adult (adj.).

adult a·dult (ə-dŭlt’, ād’ŭlt)
n.

One who has attained maturity or legal age.

A fully grown, mature organism.

adj.
Fully developed and mature.

adjective

Euphemistically meaning unsuitable for children: adult entertainment (1950s+)