Definitions for calendar year
Random House Webster's College Dictionary
Ref: See under year (def. 1). 1
Origin of calendar year:
calendar year, civil year(noun)
the year (reckoned from January 1 to December 31) according to Gregorian calendar
The amount of time between the beginning of the first day of January and the end of the last day of December in the Gregorian calendar. (365 days, or 366 in a leap year.)
The amount of time between corresponding dates in adjacent years in any calendar.
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