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the periodic discharge of blood and mucosal tissue from the uterus, occurring approximately monthly from puberty to menopause in nonpregnant women and females of other primate species. 2. the period of menstruating. Origin of menstruation. 1770-1780.
Menstruation (Definition). Menstruation is also known as Menses. Menstruation is the regular cyclical shedding of uterine (womb) lining associated with bleeding. Begins at puberty (menarche) and continus during a woman's fertile years until menopause. Cycles usually average 28 days, but can vary from 21 - 35 days.