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Leap Year :: Leap year () Bissextile; a year containing 366 days; every fourth year which leaps over a day more than a common year, giving to February twenty-nine days. See Bissextile..

February :: February (n.) The second month in the year, said to have been introduced into the Roman calendar by Numa. In common years this month contains twenty-eight days; in the bissextile, or leap year, it has twenty-nine days..

Intercalary :: Intercalary (a.) Inserted or introduced among others in the calendar; as, an intercalary month, day, etc.; -- now applied particularly to the odd day (Feb. 29) inserted in the calendar of leap year. See Bissextile, n..

Bissextile :: Bissextile (a.) Pertaining to leap year.

Bissextile :: Bissextile (n.) Leap year; every fourth year, in which a day is added to the month of February on account of the excess of the tropical year (365 d. 5 h. 48 m. 46 s.) above 365 days. But one day added every four years is equivalent to six hours each year, which is 11 m. 14 s. more than the excess of the real year. Hence, it is necessary to suppress the bissextile day at the end of every century which is not divisible by 400, while it is retained at the end of those which are divisible by 400..

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