Definition of “adult” - English Dictionary

“adult” in British English

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adultnoun [ C ]

uk /ˈæd.ʌlt/ /əˈdʌlt/ us /ˈæd.ʌlt/ /əˈdʌlt/

A1 a person or animal that has grown to full size and strength:

An adult under English law is someone over 18 years old.
Adults pay an admission charge but children get in free.

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adultadjective

uk /ˈæd.ʌlt/ /əˈdʌlt/ us /ˈæd.ʌlt/ /əˈdʌlt/

A2 grown to full size and strength:

an adult male/elephant
She spent most of her adult life in prison.

typical of or suitable for adults:

Let's try to be adult about this.

Adult films, magazines, and books show naked people and sexual acts and are not for children.

(Definition of “adult” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“adult” in American English

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adultadjective

us /əˈdʌlt, ˈæd·ʌlt/

grown to full size and strength:

More than half of adult Americans are considered overweight.

Adult also means suitable for grown people and not children:

It’s a kids’ show, but they sneak in some adult humor.

Adult movies, magazines, shows, and books include content that is intended for adults only.

adult
noun [ C ] us /əˈdʌlt, ˈæd·ʌlt/

We invited only adults to the wedding.
adulthood
noun [ U ] us /əˈdʌltˌhʊd/

When she reached adulthood, she moved away.

(Definition of “adult” from the Cambridge Academic Content Dictionary © Cambridge University Press)