month: Meaning and Definition of

month

1. Also calledany of the twelve parts, as January or February, into which the calendar year is divided.
2. the time from any day of one calendar month to the corresponding day of the next.
3. a period of four weeks or 30 days.
4. Also calledone-twelfth of a solar or tropical year.
5. Also calledthe period of a complete revolution of the moon around the earth, as the period between successive new moonsequal to 29.531 days, or the period between successive conjunctions with a starequal to 27.322 days, or the period between successive perigeesequal to 27.555 days, or the period between successive similar nodesequal to 27.212 days.
6. an unusually long period of time of indefinite length: I haven't seen him for months.