leap year

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A year that has 366 days instead of the standard 365. The extra day occurs on February 29^th. A leap year occurs whenever the year is evenly divisible by 4ùexcept for those years evenly divisible by 100; this exception, however, does not apply to years evenly divisible by 400.
In other words, every four years
(e.g., 1988, 1992, 1996, etc.) February gets an extra dayùexcept on the century year, when the extra day is not added to February, with a further exception that every four centuries, when the year is evenly divisible by 400, the extra day is added. Because the year 2000 is evenly divisible by 400, it is a leap year.
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