Obs. In 4–6 bisext(e, 6 (bisex), bysext. [ad. L. bi(s)sextus (dies), f. bis twice + sextus sixth, the name given to the intercalary day inserted by the Julian calendar every fourth year after the sixth day before the calends of March, or 24th of February.] prop. The intercalary day in leap-year; but also taken as = BISSEXTILE.
1398. Trevisa, Barth. De P. R., IX. iii. (1495), 348. The Bisexte is gaderynge of eyghtene houres whyche comyth in thre yeres wyth syxe houres of the fourth yere to make a ful daye … and the yere Bisextilis hath that name.
1530. Elyot, Gov., I. xxv. (1883), 265. Bisext, called the lepe yere.
1618. Sheph. Kal. (1656), ii. In four years, there is one Bysext.
