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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.

Although adult Liaoningosaurus specimens have not yet been found, these young fossils still provide valuable clues about ankylosaur development.

From Science Daily • Apr. 21, 2026

The Scottish FA has gone further, banning heading the day before and after matches in the professional adult game.

From BBC • Apr. 20, 2026

So, faced with adult stores and mixed-age social media feeds, girls are doing what girls have always done: watching older girls, imitating grown-up rituals, reaching for whatever is available.

From The Wall Street Journal • Apr. 20, 2026

The adult male pilot was pulled from the plane and taken to the hospital, the Los Angeles Fire Department said.

From Los Angeles Times • Apr. 20, 2026

It wasn’t Momma Bear this time—it was a full-grown adult male.

From "Two Degrees" by Alan Gratz




Vocabulary lists containing adult