Commentary: A unit of time that lasts about thirty days. Not dependent on divisions in the calendar.
He was given one month to pay his bill.
The prisoner spent two months in solitary confinement.
A moment apart from you, my love, feels like months.
WordNet 2.0 Sense Numbers: 2
Commentary: A division of the calendar. Often named. Not a definite unit of time: if today is October 30th, I can say the next month starts in two days.
My favorite month is June.
John's thesis will be due next month.
Tomorrow is the first of the month.
WordNet 2.0 Sense Numbers: 1