n. 1 (in full calendar month) a each of twelve periods into which a year is divided. b period of time between the same dates in successive calendar months. 2 period of 28 days. [Old English]
n. 1 (in full calendar month) a each of twelve periods into which a year is divided. b period of time between the same dates in successive calendar months. 2 period of 28 days. [Old English]