adult
n. countable A2 Elementary Oxford US //ˈædəɫt// UK //ˈædʌlt// adult
n. a person who is fully grown and legally responsible for themselves. In most countries, you become one when you turn 18.
n. a person who has reached the age of legal majority and is physically mature.
The museum ticket is cheaper for children than for adults.
The hotel pool is reserved for adults only during the evening hours to ensure a quiet environment for guests.
Sociologists often debate whether the transition to being an adult is defined more by biological maturity or by the financial independence required to support a household.
From French adulte, from Latin adultus (“grown up”), perfect passive participle of adolescō (“I grow up”). Compare adolescent.