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Related to preadolescence: puberty
The period of childhood just before the onset of puberty, often designated as between the ages of 10 and 12 in girls and 11 and 13 in boys.
pre′ad·o·les′cent adj. & n.
the period of life prior to or leading up to adolescence; childhood, the preadolescent stage
pre•ad•o•les•cence(ˌpri æd lˈɛs əns)
the period preceding adolescence, usu. designated as the years from 10 to 13.
pre`ad•o•les′cent, adj., n.