calendar month

month ( def 1 ).

1780–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To calendar month
Example sentences
That's because the lunar month-the time it takes the moon to cycle through its
  phases-corresponds closely to the calendar month.
The phrase has come to refer to those rare occasions when a second full moon
  appears within a single calendar month.
These services may be reimbursed once per calendar month per member.
On rare occasions the pay period may end two days before the end of the
  calendar month.
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