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.

Origin:
1625–35; adj. use of verb phrase grow up

grown-upness, noun
Dictionary.com Unabridged

grownup

[grohn-uhp]
noun
a mature, fully grown person; adult.

Origin:
1805–15; noun use of verb phrase grow up

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grown-up
 
adj
1.  having reached maturity; adult
2.  suitable for or characteristic of an adult
 
n
3.  an adult

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Once a grownup, vocabulary does shape the way you think about the world.
Never in a million years thinking it was something a grownup could grow up and
  do.
He was grownup enough to know that it would have insulted her to say that he
  had noticed nothing.
He was a grownup, but there was a readiness for play in him that lasted all his
  life.
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