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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.

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The treatment is approved in the U.S. and China for adult patients with locally advanced or metastatic non-small cell lung cancer.

From The Wall Street Journal Jul. 14, 2026

In years gone by, most people would get a bank account early in their adult life and stick with it for decades.

From BBC Jul. 12, 2026

Humans develop two sets of teeth: baby teeth and adult teeth – and that’s all.

From Science Daily Jul. 11, 2026

This is an incredible start to their adult life; most working people take years of toil to get to that level.

From MarketWatch Jul. 10, 2026

The adult standing next to the kid squeezed his shoulder and smiled proudly.

From "Boy 2.0" by Tracey Baptiste

The trial will be on 50 healthy adults aged 18-55.

From BBC Jul. 13, 2026

All distributions will be taxable, although some financial planners say young adults should convert the money into a Roth account.

From MarketWatch Jul. 13, 2026

Nieva stressed that the proposed connection between pesticide exposure and lung cancer remains unproven and requires additional investigation, especially among younger adults and women.

From Science Daily Jul. 13, 2026

The adults, hearing our incessant laughter, came into the room, instantly became horrified and confiscated the game.

From Salon Jul. 13, 2026

“Auntie North,” Danny said, “why do adults stop believing in magic? Even the ones who visit Rio Luna and then only remember their time there as dreams?”

From "The Way to Rio Luna" by Zoraida Cordova




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