Definition of adult adjective from the Oxford Advanced Learner's Dictionary

        

    adult

     adjective
    adjective
    BrE BrE//ˈædʌlt//
     
    ; NAmE NAmE//ˈædʌlt//
     
    ; BrE BrE//əˈdʌlt//
     
    ; NAmE NAmE//əˈdʌlt//
     
     
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  1. 1  fully grown or developed preparing young people for adult life the adult population adult monkeys She spent her entire adult life caring for others.
  2. 2behaving in an intelligent and responsible way; typical of what is expected of an adult synonym grown-up1 When my parents split up, it was all very adult and open. Young children become quickly bored by adult conversation.
  3. 3[only before noun] intended for adults only, because it is about sex or contains violence an adult movie
  4. see also adulthood
    Word Origin mid 16th cent.: from Latin adultus, past participle of adolescere ‘grow to maturity’, from ad- ‘to’ + alescere ‘grow, grow up’, from alere ‘nourish’.
See the Oxford Advanced American Dictionary entry: adult