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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 teenagers said they had been pressured by the adult," another source close to the case added.

From Barron's • Apr. 1, 2026

He notes that adult Uberabatitan individuals, unlike the younger specimen analyzed, likely faced the same challenges as other large sauropods when trying to stand upright.

From Science Daily • Mar. 30, 2026

Paul Dix, a UK-based teacher, expert in inclusive behaviour support and director of support organisation When The Adults Change, said "consistent adult behaviour" was "the absolute foundation of great education".

From BBC • Mar. 30, 2026

In 1855 Maryland opened the House of Refuge, becoming the first Southern state to establish a facility to remove children from adult jails and prisons.

From Slate • Mar. 30, 2026

I’m just a seventh grader, and everybody else here is an adult, thought Natalie.

From "Two Degrees" by Alan Gratz