One of the twelve portions into which the year is divided; the twelfth part of a year, corresponding nearly to the length of a synodic revolution of the moon, -- whence the name. In popular use, a period of four weeks is often called a month.
- 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.
- month of Sundays Informal An indefinitely long period of time: It will take you a month of Sundays to chop all that wood.