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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.

She has an adult daughter and a 14-year-old daughter still at home.

From MarketWatch • Apr. 13, 2026

The rom-com, which debuted in 2021, is part of a growing portfolio of young adult book adaptations that have flooded streaming platforms in recent years.

From Los Angeles Times • Apr. 13, 2026

Dorset Wildlife Trust introduced an adult pair of beavers into an enclosed site in west Dorset in February 2021, as part of a scientific study.

From BBC • Apr. 13, 2026

Sklar’s two adult children, appropriately enough, hate him, but it’s unclear whether he hated them first.

From The Wall Street Journal • Apr. 9, 2026

Nathan tried his best to ignore the fact that Devin was an adult and also a human.

From "Healer of the Water Monster" by Brian Young




Vocabulary lists containing adult