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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.

Alphie Lonergan is 84 years old and the primary carer for two of his adult children.

From BBC • 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

At the same time, the therapy also produced meaningful improvements in adult patients.

From Science Daily • Apr. 3, 2026

“You were always clinging. Onto your mother, onto whichever adult was caring for the littles that season. Dahlia and I joked that your chosen name should be Ivy, because of how tightly you clung.”

From "The Wrong Way Home" by Kate O’Shaughnessy