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bissextus

[ bih-seks-tuhs, bee- ]
/ bɪˈsɛks təs, bi- /
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noun
Also bis·sext . February 29th: the extra day added to the Julian calendar every fourth year (except those evenly divisible by 100, but not by 400, a rule introduced by the Gregorian calendar) to compensate for the approximately six hours a year by which the common year of 365 days falls short of the solar year.
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Origin of bissextus

From Late Latin bissextus (diēs) “intercalary (day)”; so called because the 6th day before the calends of March (Feb. 24th) appeared a second time once every leap year (hence the “second sixth”); see also bis1, sext1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022
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