Menarche is the term for the very first menstrual flow, which marks the onset of puberty in a female.

For context:

• Ovulation is the release of the secondary oocyte from a mature Graafian follicle.
• Menopause is the permanent cessation of menstrual cycles, occurring near 50 years of age.
• Diapause is a period of developmental arrest or dormancy seen in many organisms.