1 (in full calendar month) a each of usu. twelve periods into which a year is divided. b a period of time between the same dates in successive calendar months.
2 a period of 28 days or of four weeks.
3 = lunar month.
Phrases and idioms:
month of Sundays a very long period.
Etymology: OE monath f. Gmc, rel. to MOON
Useful english dictionary. 2012.