Bissextile
A Dictionary of Law · Henry Campbell Black · 1891
A Dictionary of Law
The 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. BLACK ACRE and WHITE ACRE,