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n. 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.

n. the period between childhood and adolescence

""A boy who turns 10 on January 2 could be playing alongside someone who doesn't turn 10 until the end of the year -- and at that age, in preadolescence, a 12-month gap in age represents an enormous difference in physical maturity.""

prosthesis    transgresses