Menopause is the end of a woman's menstrual cycle and fertility. It happens when the ovaries no longer make estrogen and progesterone, two hormones needed for a woman's fertility, and periods have stopped for 1 year.

Menopause Basics
The term "menopause" is commonly used to describe any of the changes a woman experiences either just before or after she stops menstruating, marking the end of her reproductive period.

Understanding Menopause
Menopause simply means the end of menstruation for one year. As a woman ages, there is a gradual decline in the function of her ovaries and the production of estrogen.

Source:http://www.happyolderage.com/2018/07/guild-to-menopause.html