leap day Definition

bissextile day, bissextile year, julian calendar, calendar month, common year, metemptosis, proemptosis, solar calendar, intercalary, leap year, jewish calendar, leap second, lunar month, neomenia, lunar year, synodic month, triduan, jewish calendar month, islamic calendar, tropical year, bissextile, twelfthtide, sidereal year, sidereal day, lunisolar calendar, lunisolar, gregorian calendar, islamic calendar month, quarter day, solar day, lunistice, octennial, cosmic time, hindu calendar month, civil year, anomalistic year, calendar, unit of time, trimonthly, astronomical year, sidereal time, tishri, bimestrial, novennial, solar year, hindu calendar, terdiurnal, day, civil time, annotinous, mean solar day, bimester, equidiurnal, bimillenary, religious festival, shawwal, sextan, kislev, tricennial, nychthemeron, christian holy day, bimensal, calender, trieterical, lunar calendar, spring equinox, month, columbus day, hebdomadally, religious holiday, interlunation, interlunar, ordinal number, tripaschal, nisan, year, trimestrial, iyar, period of time, birthnight, calendrer, victoria day, isocryme, time of year, phalguna, calendrical, dipaschal, cheshvan, anniversarily, advent sunday, ephemeris time, old moon, octogamy, sabbatical year, lunation, equitemporaneous, autumnal equinox, diurnation, octocentenary, nychthemeral,