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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.

Unlike adult incontinence products, baby diapers are not regulated as medical devices under the Federal Drug Administration.

From Los Angeles Times • Apr. 10, 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

Sklar’s two adult children, appropriately enough, hate him, but it’s unclear whether he hated them first.

From The Wall Street Journal • Apr. 9, 2026

The severity of Emma’s teenage plan is analyzed against the kind person she’s proven herself to be as an adult.

From Salon • Apr. 9, 2026

“Attention, everyone!” a loud adult voice rang out.

From "Trouble at the Arcade (The Hardy Boys: Secret Files, #1)" by Franklin W. Dixon




Vocabulary lists containing adult