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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 unusual color change was first noticed when researchers found an adult female at the Smithsonian Tropical Research Institute's field station on Barro Colorado Island in Panama.

From Science Daily • May 2, 2026

As an adult attending law school at night, she helped survivors of domestic violence and sexual assault navigate the judicial system.

From Los Angeles Times • May 1, 2026

Five high school students and an adult security guard were taken to hospital on Thursday, Tacoma Fire Department confirmed, adding that all were in stable condition.

From BBC • May 1, 2026

Like James Gandolfini in “Loop,” or Daniel Kaluuya in “Get Out,” or Eddie Albert in “Green Acres,” Mr. Bonneville is playing the only bona-fide sane adult in a crowd beset by mental malfunction, i.e, agendas.

From The Wall Street Journal • Apr. 30, 2026

After your rite, you’re considered an adult, and you’re entrusted with a lot more responsibility.

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




Vocabulary lists containing adult