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Definition of month:

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


moon, thirty days, calendar month, nodical, one-twelfth of a year, four weeks, tropical, lunar, synodical, sidereal, solar, anomalistic.

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