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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 (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) 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. Wikipedia