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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.

Prosecutor Michael Robertson asked Belov: "You were the adult in this situation, you could have just walked away couldn't you?"

From BBC • Jun. 11, 2026

Coyotes and other canids serve as the primary hosts for adult tapeworms.

From Science Daily • Jun. 11, 2026

Eight existing prisons have been tasked with preparing special sections for children, where they will be kept separate from adult inmates.

From Barron's • Jun. 11, 2026

All the adult actors are very pretty, including the women, though the calculation—a helpful one—was to cast performers who don’t resemble the younger selves of the present-day characters.

From The Wall Street Journal • Jun. 9, 2026

Maya-Jade said in that scolding adult voice that had made the boy so angry when they first met.

From "Not Nothing" by Gayle Forman




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