Definition of grown-up
(Entry 1 of 2)
1
: not childish or immature : adult
2
: of, for, or characteristic of adults
insisted on wearing grown-up clothes
grown-up
nounDefinition of grown-up (Entry 2 of 2)
: adult
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Merriam-Webster unabridged
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Time Traveler for grown-up
The first known use of grown-up was in 1633
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