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© 1999–2026 Urban Dictionary ®
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a person who is fully grown or developed. "children should be accompanied by an adult" Similar: grown person grown man grown woman grown-up person grown-up mature person mature man mature woman person of mature age man woman gentleman lady adjective (of a person or animal) fully grown or developed. "the adult inhabitants of the U.S" Similar: mature grown-up fully grown full-grown fully developed fully fledged of age having reached one's majority in one's prime in full bloom Opposite: infant juvenile verbINFORMAL behave in a way characteristic of a responsible adult, especially by accomplishing mundane but necessary tasks. "I've adulted with moderate success this week by compiling invoices and billing my client"
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