Definition of teenager noun from the Oxford Advanced Learner's Dictionary

 

teenager

 noun
noun
BrE BrE//ˈtiːneɪdʒə(r)//
 
; NAmE NAmE//ˈtiːneɪdʒər//
 
(informal teen especially in North American English) Youth
 
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a person who is between 13 and 19 years old a magazine aimed at teenagers Wordfinderadolescent, immature, mixed up, naive, puberty, rebellious, sulky, tearaway, teenager, young See related entries: YouthExtra examples He had grown from a tall, gangly teenager to a handsome young man. He’s acting like a lovesick teenager. Residents have been disturbed by large groups of rowdy teenagers. She’s just acting like a normal teenager. a young teenager of fourteen I first got into music as a teenager. Many teenagers are embarrassed by their parents. They complained about the behaviour of local teenagers in the park. We specifically choose topics that will appeal to teenagers.
See the Oxford Advanced American Dictionary entry: teenager