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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.

Yes, really: This idea is the impetus for exploring, in the film, whether reducing plastics can help adult men conceive.

From Slate • Apr. 16, 2026

Three measles deaths were reported nationally last year — two among unvaccinated school-age children in Texas and one in an unvaccinated adult in New Mexico.

From Los Angeles Times • Apr. 16, 2026

Single older adults without adult children are particularly at risk.

From MarketWatch • Apr. 14, 2026

The average adult produces more than a liter of urine and over 100 grams of poo each day.

From Science Daily • Apr. 13, 2026

Ms. O’Malley introduced me to lots of other adult chicken people who arrived later as “Jim Brown’s grandniece, who inherited his chickens and his good poultry sense.”

From "Unusual Chickens for the Exceptional Poultry Farmer" by Kelly Jones




Vocabulary lists containing adult