a young person who is developing into an adult
a young person who is developing into an adult : a young person who is going through adolescence
a young person, usually between the ages of 12 and 18, who is developing into an adult
This word refers to all things related to teens — teenagers are adolescent, and the adolescent stage is after puberty and before adulthood. Since adults don't have a high opinion of teenagers, this word is also an insult. Movies full of fart jokes and immature shenanigans are called adolescent. If one adult says to another "You're acting very adolescent" that means "You're acting childish." Adolescent means something close to juvenile, another word that refers to young people and childish people.