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

From Science Daily • Apr. 13, 2026

“Active adult and move-up segments have outperformed relative to the entry-level, where affordability concerns remain intense,” he says.

From Barron's • Apr. 12, 2026

Diaz, who moves countless pallets of product, jokes he was born at the factory, having spent almost his entire adult life working for the company.

From Los Angeles Times • Apr. 12, 2026

Mari Adam, a certified financial planner and educator, has been trying to get her own adult children to bump up contributions from 6% to 9% — and having no luck.

From MarketWatch • Apr. 10, 2026

But the human body has more than a few to spare—altogether, there are about 7 octillion atoms in the average adult.

From "Meltdown" by Deirdre Langeland




Vocabulary lists containing adult