Definition of grown-up adjective from the Oxford Advanced American Dictionary

     

    grown-up1

     adjective
    adjective
     
     
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  1. 1(of a person) mentally and physically an adult synonym adult What do you want to be when you're grown-up? She has a grown-up son.
  2. 2suitable for or typical of an adult The child was clearly puzzled at being addressed in such a grown-up way.
See the Oxford Advanced Learner's Dictionary entry: grown-up

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