The cessation of menstruation is called?

Amenorrhea: Absence of period for 3 consecutive months called Amenorrhea and a cause has to be identified.

Menopause: if you mean with aging? But the periodic menstrual period has " stops" and starts!

Amenorrhea: Menstruation can be absent due to multiple issues including menopause, stress, polycystic ovary syndrome, thyroid and other hormone issues and pregnancy to name a few possibilities.