1) Childhood stage 2) Time of life 
[n] - a period of two years immediately prior to the onset of puberty when growth and changes leading to sexual maturity occur
prepuberty (pree PYOO buhr tee) (s), prepuberties (pl) The period of life preceding puberty; especially, the two or three years immediately before puberty.
noun a period of two years immediately prior to the onset of puberty when growth and changes leading to sexual maturity occur
the period of life just prior to sexual maturation.