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| leap year (plural leap years) |
noun |
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| Definition: |
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year with 366 days: a year with an extra day, February 29, added to make up the difference between the 365-day calendar and the actual duration of the Earth's orbit of the Sun. Leap years occur every four years, except for years ending in 00 that are not divisible by 400.
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| [Probably because any given date falls two days later than in the preceding year, instead of one] |
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