MENARCHE By N., Pam M.S. - April 7, 2013 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." Related Psychology Terms ADRENARCHE NUBILE EPIDEMIOLOGY PUBESCENT PREADOLESCENCE OVARY LATENCY STAGE CALENDAR METHOD OF BIRTH CONTROL COOPERATIVE LEARNING RITE OF PASSAGE Cite this page: N., Pam M.S., "MENARCHE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/menarche/ (accessed November 28, 2020).