- The definition of a teenager is a person who is between ages 13 and 19, all numbers ending in the suffix -teen.
An example of a teenager is someone who just has their thirteenth birthday.
A teenager, like one of these young people, is considered an adolescent.
teenager definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a person in his or her teens
teenager definition by American Heritage Dictionary
A person between the ages of 13 and 19; an adolescent.