a person in his or her teens.

1935–40; teenage + -er1

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World English Dictionary
teenager (ˈtiːnˌeɪdʒə)
a person between the ages of 13 and 19 inclusive

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

derived noun from teenage (q.v.), 1941. The earlier word for this was teener, attested in Amer.Eng. from 1894, and teen had been used as a noun to mean "teen-aged person" in 1818.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for Teenager
The diary describes how a teenager is playing baseball in guilford.
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