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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.

"I was around 18 at the time of the launch - it was a big part of my adult life growing up," he said.

From BBC • Jun. 6, 2026

Alex Matturri, a former CEO of S&P Dow Jones Indices, wrote on LinkedIn that his one-time employer was “the adult in the room” for sticking with its original policies.

From MarketWatch • Jun. 5, 2026

Photos showed one of the seized Madagascar cockroaches was almost big enough to completely cover the palm of an adult hand.

From Barron's • Jun. 5, 2026

Parents told us they are spending money to help their adult children with child care, rent, down payments for homes and vacations.

From The Wall Street Journal • Jun. 4, 2026

Mom is the only adult who doesn’t seem proud or happy for me.

From "The Wrong Way Home" by Kate O’Shaughnessy




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