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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.

Two adult gray whales washed up dead in the nearby Ocean Shores area earlier in April, Cascadia Research Collective said.

From BBC • Apr. 6, 2026

In the same vein, all the adult children out there can ask their parents if they want to be part of their “family plan” for getting taxes done.

From MarketWatch • Apr. 6, 2026

“The West Wing” actor Busfield has three adult children from two previous marriages and is the stepfather to Gilbert’s two adult sons from her two previous marriages.

From Los Angeles Times • Apr. 6, 2026

As a teenager and young adult, Jessica tried to learn more about her mom’s case.

From Slate • Apr. 6, 2026

For the record, this is the only time I’d ever call an adult by their first name.

From "The Manifestor Prophecy" by Angie Thomas