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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

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

From Slate • Apr. 6, 2026

We’d have been rolling our eyes if it had been any other adult.

From "Flying Through Water" by Mamle Wolo