American Heritage Dictionary
(1)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
But even at menstruation, they're better than the average man.— Helen Fisher tells us why we love + cheat
In addition, consistent with the hermeneutic behind their categorical argument, v. 19 (intercourse during menstruation, which is more akin to ceremonial law) would disallow the intrinsic sinfulness of the next verse (adultery).— Conservapedia - Recent changes [en]
Her term ended because she was approaching menstruation, after which she would be ritually unclean.— iac world news feed
Another is a corpus luteum cyst (which may rupture about the time of menstruation, and take up to three months to disappear entirely).— Find Me A Cure
Pain in menstruation, which is much more frequent, is dependent upon other conditions than the activity of the ovaries, and lasts a very much shorter time than does either the function of ovulation, or even than the uterine congestion secondary to it.— The Education of American Girls

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a month.
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