It's a shorter way of saying "menstrual period" as opposed to other kinds of periods, such as orbital periods, periods of time, etc. The etymology of the word is something along the lines of "Interval, season, time, circuit" etc.
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A period of 100 years is called a century.
A period of 10 years is called a decade.
Well, darling, a period of one year is called a "year." It's not rocket science, sweetie. Just like how a period of one month is called a "month." Keep it simple, honey.
A period of ten years is a decade.
Such is called the period of the wave. The period is the reciprocal of the frequency.