'preteen' definitions:

Definition of 'preteen'

From: WordNet
adjective
Of or relating to or designed for children between the ages of 9 and 12; "a preteen party"; "preteen clothing" [syn: preteen, preadolescent]
noun
A preadolescent boy or girl (usually between 9 and 12 years of age); "little league is intended for the preteens" [syn: preteen, preteenager]