calendar month
From Longman Dictionary of Contemporary EnglishRelated topics: Chronologycalendar monthˌcalendar ˈmonth noun [countable] 1 TMCone of the 12 months of the year Salaries will be paid at the end of the calendar month.2 TMCa period of time from a specific date in one month to the same date in the next monthExamples from the Corpuscalendar month• Be sure to apply before the first of the calendar month when you want the rebate to start.