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civil yearThe length of the year as reckoned for ordinary purposes. Any civil year must contain an exact number of days, which in the Gregorian calendar usually amounts to 365 but is equal to 366 in leap years.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
civil year[¦si·vəl ¦yir]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.