Meaning of CALENDAR YEAR in English

CALENDAR YEAR

noun

1. : a period of a year beginning and ending with the dates which are conventionally accepted as marking the beginning and end of a numbered year (as January 1 and December 31 in the Gregorian calendar)

2. : a period of time equal in length to that of the year in the calendar conventionally in use (as in the Gregorian calendar 365 days or when a February 29 is included 366 days)

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.