MENARCHE

is the first incidence or occurrence of menstruation in a female. This marks the 'official' onset of puberty.

MENARCHE: "The menarche is a landmark which identifies the first time the process of menstruation occurs within a female."
Cite this page: N., Pam M.S., "MENARCHE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/menarche/ (accessed November 28, 2020).
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