- The definition of a month is any of the twelve parts of the calendar year.
An example of a month is January.
- any of the main parts (usually twelve) into which the calendar year is dividedalso calendar month
- the time from any date of one month to the corresponding date of the next
- a period of four weeks or 30 days
- the period of a complete revolution of the moon around the earth with respect to some object; esp.,
- the period () marked by two successive lunar conjunctions with the sun, equal on the average to 29.53 days: also called lunar month
- the sidereal month
- one twelfth of the solar yearin full solar month
Origin of monthMiddle English ; from Old English monath, akin to German monat, Old Norse manuthr ; from Germanic an unverified form menōth- ; from Indo-European an unverified form mēnōt, month, moon, variant, variety of mēn: see moon
month after month
month by month
month in, month out
month of Sundays
- A unit of time corresponding approximately to one cycle of the moon's phases, or about 30 days or 4 weeks.
- One of the 12 divisions of a year as determined by a calendar, especially the Gregorian calendar. Also called calendar month.
- A period extending from a date in one calendar month to the corresponding date in the following month.
- A sidereal month.
- A lunar month.
- A solar month.
Origin of monthMiddle English moneth, from Old English mōnath; see mē-2 in Indo-European roots. Usage Note: The singular noun month, preceded by a number and a hyphen, is used as a compound adjective: a three-month vacation. The plural possessive form without a hyphen is also standard: a three months' vacation.
(plural months) The plural is occasionally seen as month (unchanged)
- A period into which a year is divided, historically based on the phases of the moon. In the Gregorian calendar there are twelve months: January, February, March, April, May, June, July, August, September, October, November and December.
- July is my favourite month.
- A period of 30 days, 31 days, or some alternation thereof.
- We went on holiday for two months.
- month of Sundays
- time of the month
From Middle English month, moneth, from Old English mōnað (“month”), from Proto-Germanic *mēnōþs (“month”), from Proto-Indo-European *mḗh₁n̥s (“moon, month”), probably from Proto-Indo-European *mê- (“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 måned (“month”); 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.