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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.

New college grads are starting their adult lives in a challenging environment.

From MarketWatch • Apr. 14, 2026

Pereira, who runs the financial tech company, says his longevity offers a glimpse to his own adult sons about what life can be like in their eighth decade.

From The Wall Street Journal • Apr. 13, 2026

The average adult produces more than a liter of urine and over 100 grams of poo each day.

From Science Daily • Apr. 13, 2026

Young adult adaptations are at the core of the platform’s broader efforts to champion diversity in storytelling, said Peter Friedlander, Prime Video’s head of global TV.

From Los Angeles Times • Apr. 13, 2026

“You’re an adult, and you still wanted a friendship bracelet?”

From "The School for Whatnots" by Margaret Peterson Haddix




Vocabulary lists containing adult