Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: , past participle of adolescere 'to grow up'

adult

2 adjective
     
adult2 W3
1 [only before noun] fully grown or developed:
an adult lion
the adult population
He lived most of his adult life in Scotland.
2 typical of an adult's behaviour or of the things adults do:
dealing with problems in an adult way
That wasn't very adult of you.
3 [only before noun] adult films, magazines, etc are about sex or related to sex:
The film is rated R for language and adult themes.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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