bissextile[bis seks′til, -təl, -tīl′]
bissextile definition by Webster's New World
- denoting the extra day (February 29) of a leap year
- designating or of a leap year
Origin: Late Latin bisextilis, containing an intercalary day ; from bisextus ; from bis, twice (see bi-) plush sextus, sixth: Feb. 24 (sixth day before the calends of March) was reckoned twice every fourth year
bissextile definition by American Heritage Dictionary
- Of or relating to a leap year.
- Of or relating to the extra day falling in a leap year.
Origin: Late Latin bissextīlis, containing an intercalary day, from bisextus (diēs), bis sextus (diēs) and 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 Sext .