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Definitions

adult

[uh-duhlt, ad-uhlt] / əˈdʌlt, ˈæd ʌlt /
ADJECTIVE
being mature, fully grown
Synonyms
Antonyms


NOUN
a mature, fully grown person
Synonyms
STRONGEST
STRONG
grownup
WEAK
Antonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Researchers found the odds of adult koalas being admitted into care or dying in the Australian state of New South Wales rose when average maximum temperatures over a seven-day period reached 27C.

From Barron's • May 26, 2026

Sibling rivalry does not always improve when you get older and embark on adult life.

From MarketWatch • May 26, 2026

"I really do think it's a problem. I'll have to live with that anxiety until my daughter becomes an adult."

From BBC • May 23, 2026

In part, this archetype, as Fiedler dubs it, reflects our literature’s recurrent failure to deal honestly with adult heterosexual love and its attendant responsibilities.

From The Wall Street Journal • May 22, 2026

Given my job now, why didn’t Frances Miranda Gonzagaga ever arrange to update my exterior shell to make me look like an adult?

From "The School for Whatnots" by Margaret Peterson Haddix




Vocabulary lists containing adult


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