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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

Researchers at Mass General Brigham have uncovered evidence that the thymus, a small immune system organ long thought to lose its importance after childhood, may play a major role in adult health.

From Science Daily • Jun. 1, 2026

The conversation about the intricacies of supporting adult children got surprisingly personal.

From The Wall Street Journal • May 29, 2026

“Even as an adult, he seemed haunted by that place.”

From "The Sea in Winter" by Christine Day




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