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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.

Due to the conservation effort an adult fly seen in 2022 was the first to be spotted in the wild for a decade.

From BBC • Apr. 21, 2026

That size is far below what scientists expect for adult ankylosaurs, which often grow to three meters or longer.

From Science Daily • Apr. 21, 2026

YA fiction is still thriving but is overwhelmingly the domain of adult women.

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

G talked to me like an adult, which is another thing I’ve always loved about her.

From "Popcorn" by Rob Harrell




Vocabulary lists containing adult