“month” in Latin

mensis: half a month, semestrium: a lunar month, mensis lunaris: of a month, that lasts a month, unius mensis; menstruus: two, three, four, five, six months long, bimestris, trimestris, quadrimestris, quinquemestris, semestris: to serve for a month, mensem vertentem servire: every third month, tertio quoque mense: every month, singulis mensibus: that returns or happens every month, menstruus: the first of the month, Kalendae: the fifth of the month, Nonae (except in March, May, July, and October, when the Nonae fell on the seventh day): the thirteenth of the month, Idus (except in the four months already mentioned, in which the Idus fell on the fifteenth; Vid: Zumpt, § 867; Pract. Introd., i: 523, sqq.).