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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.

Despite this, Lynn went on to gain a degree and a PHD - and is now an adult advisory board member at the Dyscalculia Network.

From BBC • Apr. 15, 2026

Traditional custodial accounts are available at most brokerages and let an adult, usually a parent, manage an account on behalf of a child of any age.

From The Wall Street Journal • Apr. 14, 2026

She has an adult daughter and a 14-year-old daughter still at home.

From MarketWatch • 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

But the human body has more than a few to spare—altogether, there are about 7 octillion atoms in the average adult.

From "Meltdown" by Deirdre Langeland




Vocabulary lists containing adult