Definition of adult adjective from the Oxford Advanced American Dictionary



    , NAmE//ˈædʌlt//
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  1. 1fully grown or developed preparing young people for adult life the adult population adult monkeys
  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.
  3. 3[only before noun] intended for adults only, because it is about sex or contains violence an adult movie see also adulthood
See the Oxford Advanced Learner's Dictionary entry: adult