/ twiːn; NAmE / (also tween·ager / ˈtwiːneɪdʒə(r); NAmE /) noun
a child between the ages of about 10 and 12
SYN pre-teen
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WORD ORIGIN
1940s: of unknown origin.
TWEEN
Meaning of TWEEN in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005