- denoting the extra day (February 29) of a leap year
- designating or of a leap year
Origin of bissextileLate Latin bisextilis, containing an intercalary day from bisextus from bis, twice (see bi-) + sextus, sixth: Feb. 24 (sixth day before the calends of March) was reckoned twice every fourth year
- Of or relating to a leap year.
- Of or relating to the extra day falling in a leap year.
Origin of bissextileLate Latin bissextīlis containing an intercalary day from bisextus (diēs), bis sextus (diēs) Latin bisextum intercalary day bis twice ; see bis. sextus sixth (because the sixth day before the Calends of March on February 24 occurred twice every leap year) ; see sext1.
(comparative more bissextile, superlative most bissextile)
- Having an extra day (of a leap year).
- A leap year; A year having an extra day.
From Latin bisextilis (“containing an intercalary day”), from bisextus (“intercalary day”), from bis- (“two”) + sextus (“sixth”). In leap years there were two sixth days before March in the Roman calendar, thus the succession of days was ... 7 - 6 - 6* - 5 ...