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bissextus
[ bih-seks-tuhs, bee- ]
noun
- Also bissext. February 29th: the extra day added to the Julian calendar every fourth year (except those evenly divisible by 100, but not by 400, a rule introduced by the Gregorian calendar) to compensate for the approximately six hours a year by which the common year of 365 days falls short of the solar year.
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Word History and Origins
Origin of bissextus1
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