Definition of: month

(munth) noun
1. A unit of time, originally equal to the interval between two new moons, afterward called a lunar month, and equal on the average to 29.53 days.
2. One of the 12 parts into which the calendar year is divided, called a calendar month; loosely, thirty days or four weeks.
3. The twelfth part of a solar year: also solar month. ♦ Collateral adjective: mensal. [OE mōnath. Akin to MOON.]