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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.

In fact, nearly one-quarter of U.S. adults — about 63 million — provide ongoing care to a child or adult with a medical condition or disability.

From MarketWatch • Jun. 2, 2026

A separate Economist/YouGov poll found that 51 percent of U.S. adult citizens are pessimistic about the long-term effects of A.I. while just 25 percent are optimistic.

From Slate • Jun. 2, 2026

"I love construction," the president, who spent much of his adult life as a real-estate developer, said.

From BBC • Jun. 1, 2026

Because the organ gradually shrinks after puberty and produces fewer new T cells over time, many scientists assumed it played only a limited role in adult health.

From Science Daily • Jun. 1, 2026

Her hair was up, and that made her an adult right there.

From "The Teacher’s Funeral" by Richard Peck




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