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

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

“adult” in American English

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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.

noun [ C ] us /əˈdʌlt, ˈæd·ʌlt/

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

When she reached adulthood, she moved away.

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