(in the Gregorian calendar) a year that contains 366 days, with February 29 as an additional day: occurring in years whose last two digits are evenly divisible by four, except for centenary years not divisible by 400.
a year containing an extra day or extra month in any calendar.
Origin of leap year
1350–1400; Middle English lepe yere
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for leap year
Historical Examples of leap year
British Dictionary definitions for leap year
a calendar year of 366 days, February 29 (leap day) being the additional day, that occurs every four years (those whose number is divisible by four) except for century years whose number is not divisible by 400. It offsets the difference between the length of the solar year (365.2422 days) and the calendar year of 365 days
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for leap year
late 14c., from leap (v.) + year. So called from its causing fixed festival days, which normally advance one weekday per year, to "leap" ahead one day in the week.
Online Etymology Dictionary, © 2010 Douglas Harper