a period from one new moon until the next. / a synodic month of approximately 29.53 days, measured from a lunar phase until the return of that same phase.

(idiomatic, informal) A very long time; a period regarded as too long.

(astronomy) the interval between the moon's successive passing of the same moving node.

a month of approximately 29.53 days, measured from a lunar phase until the return of that same phase. The long-term average duration is 29.530 588 days (29 d 12 h 44 min 2.8 s), or about 29 ½ days.

A month with an extra day in a leap year.

a religious memorial service held for the deceased one month after their funeral.

(euphemistic) Synonym of menstruation: the monthly period during which a fertile woman menstruates.

A period of time between two consecutive passages of the Moon through the same orbital node. The draconic month is shorter than the sidereal month, due to precession of the Moon's orbit. An average one lasts 27 days, 5 hours, 5 minutes, 35.8 seconds.

One person's working time for a month, or the equivalent, used as a measure of how much work or labor is required or consumed to perform some task.

The period of duration from the first date of one month to the last date of the same month, which can thus vary from 28 to 31 days in length.