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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.

We begin our lives as single fertilized eggs, which repeatedly divide and sequentially specialize into the 30 trillion or so cells that make up the adult body.

From The Wall Street Journal • Apr. 20, 2026

One year, I hosted an adult field day at the park with sack races, water balloons and snow cones, so I have some fun ideas for you.

From Los Angeles Times • Apr. 20, 2026

As the New York Times article noted, teens and young women are waiting until they’re a little older because they do take adult responsibilities seriously.

From Salon • Apr. 20, 2026

Many of those that turned up in the bay are adult and juvenile males that are heading to the Arctic.

From BBC • Apr. 19, 2026

"Before I knew it, I was that unthinkable thing: an adult of Rin who could not swim."

From "Rowan of Rin" by Emily Rodda




Vocabulary lists containing adult