[uh-duhlt, ad-uhlt]
having attained full size and strength; grown up; mature: an adult person, animal, or plant.
of, pertaining 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.

1525–35; 1925–30 for def 3; < Latin adultus grown (past participle of adolēre to make grow), equivalent to ad- ad- + ul- (identical with base al- in aliment, ol- in prolific) + -tus past participle suffix

adulthood, noun
adultlike, adjective
adultly, adverb
adultness, noun
nonadult, adjective, noun
quasi-adult, adjective
subadult, adjective, noun
subadultness, noun
unadult, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adult (ˈædʌlt, əˈdʌlt)
1.  having reached maturity; fully developed
2.  of or intended for mature people: adult education
3.  regarded as suitable only for adults, because of being pornographic: adult films and magazines
4.  a person who has attained maturity; a grownup
5.  a mature fully grown animal or plant
6.  law Compare infant a person who has attained the age of legal majority (18 years for most purposes)
[C16: from Latin adultus, from adolēscere to grow up, from alēscere to grow, from alēre to feed, nourish]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1530s (but not common until mid-17c.), from L. adultus "grown up," pp. of adolescere "grow up, mature" (see adolescent). As a euphemism for "pornographic," it dates to 1958 and does no honor to the word. The noun meaning "adult person" is from 1650s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

adult a·dult (ə-dŭlt', ād'ŭlt)

  1. One who has attained maturity or legal age.

  2. A fully grown, mature organism.

Fully developed and mature.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
One possible interpretation: people whose brains mature early might be more prone to engage in adult activities.
Less than two hours of training over a few days produced noticeable brain
  changes in adult learners.
Now, chances are the dinosaur in your head is an adult animal.
Handpicking is an effective way to reduce adult populations.
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