adult Definition in the Cambridge English Dictionary
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Definition of “adult” - English Dictionary

Definition of "adult" - American English Dictionary

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adultadjective

 us   /əˈdʌlt, ˈæd·ʌlt/
grown to ​fullsize and ​strength: More than ​half of adult ​Americans are ​consideredoverweight. Adult also ​meanssuitable for ​grownpeople and not ​children: It’s a ​kids’ show, but they ​sneak in some adult ​humor. Adult ​movies, ​magazines, ​shows, and ​booksincludecontent 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)

Definition of "adult" - British English Dictionary

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adultnoun [C]

uk   us   /ˈæd.ʌlt/ /əˈdʌlt/
A1 a ​person or ​animal that has ​grown to ​fullsize and ​strength: An adult under ​Englishlaw is someone over 18 ​yearsold. Adults ​pay an ​admissioncharge but ​children get in ​free.
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adultadjective

uk   us   /ˈæd.ʌlt/ /əˈdʌlt/
A2 grown to ​fullsize 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 ​nakedpeople and ​sexualacts and are not for ​children.
(Definition of adult from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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