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grownup

[grohn-uhp]
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noun
  1. 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

grown-up

[grohn-uhp]
adjective
  1. having reached the age of maturity.
  2. characteristic of or suitable for adults: grown-up behavior; grown-up fiction.
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Origin of grown-up

First recorded in 1625–35; adj. use of verb phrase grow up
Related formsgrown-up·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for grownup

Contemporary Examples

Historical Examples

  • This was too big a thing, and too private, to tell a grownup.

    Games

    Katherine MacLean

  • The grownup straightened away from the fence, preparing to walk off.

    Games

    Katherine MacLean

  • His mother, his sister Margaret, and their grownup friends had finished their tea and were approaching from the house.

    Penrod

    Booth Tarkington

  • Onward and still onward to a glorious end, left entirely to myself and entrusted with an important task like a grownup person!

  • He remembered Blanche Seymour as a passionate dancer still when he began to go to grownup parties.


British Dictionary definitions for grownup

grown-up

adjective
  1. having reached maturity; adult
  2. suitable for or characteristic of an adult
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noun
  1. an adult
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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