Adult definition is - fully developed and mature: grown-up. How to use adult in a sentence.
It's also common as a gerund—that is, in the form adulting as a noun, as in " Adulting is hard" or "I'm not very good at adulting." To adult is to behave like an adult.
Adult definition, having attained full size and strength; grown up; mature: an adult person, animal, or plant. See more.
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