The definition of grown-up is someone or something that is mature or intended for an adult.adjective
An example of something that would be described as grown up is an R rated movie.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
- that is an adult
- of, for, or like an adult
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- Of, characteristic of, or intended for adults: grown-up movies; a grown-up discussion.
- Having or showing maturity in outlook, attitude, or appearance: a grown-up attitude toward work.