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One who has attained maturity or legal age.
(noun)
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Biology A fully grown, mature organism.
(noun)
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Fully developed and mature.
(adjective)
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Relating to, intended for, or befitting adults: adult education.
(adjective)
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Containing or dealing in explicitly sexual material; pornographic: adult movies; adult bookstores.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.