The day added to February in leap years.
Definition of Bissextile
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Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
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Ballentine's Law Dictionary -
Black's Law Dictionary: 2nd EditionThe day which is added every fourth year to the month of February, in order to make the year agree with the course of the sun. Leap year, consisting of 366 days, and happening every fourth year, by the addition of a day in the month of February, which in that year consists of twenty-nine days.