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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.

The case occurred in an unvaccinated adult who had close contact with someone who had traveled internationally, the San Francisco Department of Public Health said.

From Los Angeles Times • Apr. 18, 2026

The Prince of Wales, now a popular watering hole of choice for thousands of thirsty Six Nations supporters, was previously a theatre and even an adult cinema.

From BBC • Apr. 18, 2026

“As an adult, I am really leaning in to being proud to be Chinese.”

From The Wall Street Journal • Apr. 17, 2026

We are both in our early 50s, and we both have adult children.

From MarketWatch • Apr. 16, 2026

“The way I see it, we didn’t fail Papá, he failed us. He’s the adult here.”

From "Summer of the Mariposas" by Guadalupe García McCall




Vocabulary lists containing adult