Month

[Sarah]

One of the twelve portions into which the year is divided; thetwelfth part of a year, corresponding nearly to the length of asynodic revolution of the moon, -- whence the name. In popular use, aperiod of four weeks is often called a month.

[Sarah]

One of 12 periods in a [year]. Has 28, 29, 30, or 31 days. Tends to go by rapidly, especially during the summer.

[Britney]

Each of the twelve named periods into which a year is divided.