growing to manhood or womanhood; youthful.
having the characteristics of adolescence or of an adolescent.
an adolescent person.

1475–85; < Latin adolēscent- (stem of adolēscēns growing up, present participle of adolēscere), equivalent to adol(ē)- (see adult) + -ēsc- -esce + -ent- -ent

adolescently, adverb
postadolescent, adjective, noun
subadolescent, adjective, noun

adolescence, adolescents (see synonym study at adolescent).

1. immature, young. 3. youth, teenager, minor. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adolescent (ˌædəˈlɛsənt)
1.  of or relating to adolescence
2.  informal behaving in an immature way; puerile
3.  an adolescent person

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 15c., from M.Fr. adolescent, from L. adolescentem (nom. adolescens), prp. of adolescere "grow up," from ad- "to" + alescere "be nourished," hence, "increase, grow up," inchoative of alere "to nourish" (see old). The adj. is first attested in 1785. Adolesce was a back-formed
verb used early 20c. by H.G. Wells, G.B. Shaw, Louis MacNeice, but it seems not to have taken.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

adolescent ad·o·les·cent (ād'l-ěs'ənt)
Of, relating to, or undergoing adolescence. n.
A young person who has undergone puberty but who has not reached full maturity; a teenager.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The venomous cobra is an adolescent and will likely come out of hiding when she
  is hungry.
Hay and Meldrum analyzed survey answers from 426 adolescents with an average
  age of 15.
Don't lead your friend down that path, and don't make yourself look like an
She tells the adolescent boy who greets her that she's looking for puppies to
  give to her nephews for Christmas.
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