having reached the age of maturity.
characteristic of or suitable for adults: grown-up behavior; grown-up fiction.

Origin of grown-up

First recorded in 1625–35; adj. use of verb phrase grow up
Related formsgrown-up·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Historical Examples of grown-up

British Dictionary definitions for grown-up



having reached maturity; adult
suitable for or characteristic of an adult


an adult
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012