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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.

He has one adult son, from whom he is estranged, and a niece.

From MarketWatch • Apr. 7, 2026

Two adult gray whales washed up dead in the nearby Ocean Shores area earlier in April, Cascadia Research Collective said.

From BBC • Apr. 6, 2026

“The West Wing” actor Busfield has three adult children from two previous marriages and is the stepfather to Gilbert’s two adult sons from her two previous marriages.

From Los Angeles Times • Apr. 6, 2026

As a teenager and young adult, Jessica tried to learn more about her mom’s case.

From Slate • Apr. 6, 2026

Like Andre and I are the children and she’s the adult, even though she’s only seventeen.

From "South of Somewhere" by Kalena Miller