adult - definition and synonyms


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  1. 1
    [only before noun] your adult life is the whole period of your life after you have become an adult

    She was born in Vietnam but has spent most of her adult life in the US.

    1. a.
      involving people who are adults

      59% of the adult population

      a book enjoyed by young and adult readers

  2. 2
    [only before noun] adult magazines, films, and books are intended for adults and not children because they are about sex
  3. 3
    sensible or serious

    Can you try and be a little more adult about this?

  4. 4
    [only before noun] completely grown

    an adult cat