leap year definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a year of 366 days in the Gregorian calendar, occurring every fourth year: the additional day, Feb. 29, makes up for the time lost annually when the approximate 365-day cycle is computed as 365 days: a leap year is a year whose number is exactly divisible by 4, or, in case of the final year of a century, by 400
leap year definition by American Heritage Dictionary
- A year in the Gregorian calendar having 366 days, with the extra day, February 29, intercalated to compensate for the quarter-day difference between an ordinary year and the astronomical year.
- An intercalary year in a calendar.