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.

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) An indefinitely long period of time.

Originally, the interval from one new moon to the next, called specifically a lunar, synodical, or illuminative month.

One twelfth part of a tropical year, or 30 days, 10 hours, 29 minutes, 3. 8 seconds: called specifically a solar month.

One of the twelve parts into which the calendar year is arbitrarily divided: called specifically a calendar month.