Etymology
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teenager (n.)

also teen ager, teen-ager; 1922, derived noun from teenage (q.v.). The earlier word for this was teener, attested in American English from 1894, and teen had been used as a noun to mean "teen-aged person" in 1818, though this was not common before 20c.

updated on January 20, 2014

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Definitions of teenager from WordNet

teenager (n.)
a juvenile between the onset of puberty and maturity;
Synonyms: adolescent / stripling / teen
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.