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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.

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

A 53-year-old mother of three adult children, Shelley had discovered a new sense of purpose at an age when many people start checking the math on their retirement plans.

From The Wall Street Journal • 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

Unified adult school and works for the district as an attendance counselor.

From Los Angeles Times • May 29, 2026

“Teddy! Stop,” I beg, and the phone-scrolling adult gives me an annoyed look.

From "Keeping Pace" by Laurie Morrison




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