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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

The first involved an adult male and two kits sourced from Scotland.

From BBC • Apr. 7, 2026

In the same vein, all the adult children out there can ask their parents if they want to be part of their “family plan” for getting taxes done.

From MarketWatch • 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

The fame, adult praise, new clothes, and excitement of their celebrity were benefits that almost any teenager would love.

From "American Spirits" by Barb Rosenstock