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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 analysis revealed previously unknown patterns of connectivity, including direct links between cell types that had not been known to connect in the adult brain.

From Science Daily • Apr. 7, 2026

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

From MarketWatch • Apr. 7, 2026

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

From Slate • Apr. 6, 2026

The proposal included plans to release 30 adult beavers, likely as 15 pairs, with any additional dependent kits in their family groups, which could take the total up to 50.

From BBC • Apr. 3, 2026

“Yeah, well, I don’t want it to be my responsibility! Why should it be on me? I still don’t have all my adult teeth!”

From "Impossible Creatures" by Katherine Rundell