adult - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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English definition of “adult”

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adult

noun [C] uk   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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adult

adjective uk   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 Learners Dictionary & Thesaurus © Cambridge University Press)
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