(US, slang) Engaging in activities typically associated with adulthood. / (nonstandard) Adultery.

present participle of adult

Content, such as pornography or violence, that is not generally thought to be appropriate for viewing by children.

(euphemistic) a pornographic film

A person who has achieved the age of majority but whose character and personality are still developing as they gain experience.

plural of young adult

plural of adult movie

(euphemistic) An old person. / Used other than figuratively or idiomatically: see older, adult.

A category of music including soft rock, ballads, easy listening, soul, and rhythm and blues.

(UK, law) An adult, such as a parent, guardian, or social worker, whose role is to safeguard the interests of young people detained by the police, and who must be present at such interviews.