Meaning

noun a juvenile between the onset of puberty and maturity

adjective relating to or peculiar to or suggestive of an adolescent

adjective being of the age 13 through 19

originFirst attested ?1440, from Middle English adolescent, from Middle French adolescent or directly from Latin adolescentem, accusative form of adolescens, present participle of adolēscere (“to become adult, grow up”), from ad- (“to”) + alēscere (“to grow or become nourished”). The adjective first appeared in 1785.

Etymology from Wiktionary, CC BY-SA 3.0