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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

With so much spending on healthcare, older boomers—and their adult kids—expect better results and a less confusing, complicated and fragmented system.

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

The rom-com, which debuted in 2021, is part of a growing portfolio of young adult book adaptations that have flooded streaming platforms in recent years.

From Los Angeles Times • Apr. 13, 2026

“After yesterday, I think you should have an adult with you.”

From "Caterpillar Summer" by Gillian McDunn




Vocabulary lists containing adult