From Middle English month, moneth, from Old English mōnaþ (“month”), from Proto-Germanic *mēnōþs (“month”), from Proto-Indo-European *mḗh₁n̥s (“moon, month”), probably from Proto-Indo-European *meh₁- (“to measure”), referring to the moon's phases as the measure of time, equivalent to moon + -th. Cognate with Scots moneth (“month”); North Frisian muunt (“month”); Saterland Frisian Mound (“month”), Dutch maand (“month”); German Low German Maand, Monat (“month”); German Monat (“month”); Danish and Norwegian Bokmål måned (“month”); Norwegian Nynorsk and Swedish månad (“month”); Icelandic mánuði (“month”); Latin mēnsis (“month”); Ancient Greek μήν (mḗn); Armenian ամիս (amis); Old Irish mí; Old Church Slavonic мѣсѧць (měsęcĭ). See also moon.
month (plural months or (rare) month)
- A period into which a year is divided, historically based on the phases of the moon.
- A period of 30 days, 31 days, or some alternation thereof.
- (obsolete, in the plural) A woman's period; menstrual discharge.