grownup

[ grohn-uhp ]
/ ˈgroʊnˌʌp /

noun

a mature, fully grown person; adult.

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Origin of grownup

First recorded in 1805–15; noun use of verb phrase grow up

Definition for grownup (2 of 2)

grown-up
[ grohn-uhp ]
/ ˈgroʊnˈʌp /

adjective

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

OTHER WORDS FROM grown-up

grown-upness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for grownup

British Dictionary definitions for grownup

grown-up

adjective

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

noun

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