"preteen" in the noun sense
1. preteen, preteenager
a preadolescent boy or girl (usually between 9 and 12 years of age
"little league is intended for the preteens"
"preteen" in the adjective sense
1. preteen, preadolescent
of or relating to or designed for children between the ages of 9 and 12
"a preteen party"
"preteen clothing"
Source: WordNet® (An amazing lexical database of English)
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