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- Dictionaryleap year/ˈliːp jɪə/
noun
- 1. a year, occurring once every four years, which has 366 days including 29 February as an intercalary day.
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noun
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A leap year is a calendar year that contains an additional day compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year. Since astronomical events and seasons do not repeat in a whole number of days, calendars having a constant number of days each year will unavoidably drift over time with respect to the ev... Wikipedia