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bissextile

(bis seks′til, -təl, -tīl′)

adjective

denoting the extra day (February 29) of a leap year
designating or of a leap year

Origin: LL bisextilis, containing an intercalary day < bisextus < bis, twice (see bi-) + sextus, sixth: Feb. 24 (sixth day before the calends of March) was reckoned twice every fourth year

noun

Rare leap year

See bissextile in American Heritage Dictionary 4

adjective

Of or relating to a leap year.
Of or relating to the extra day falling in a leap year.

noun

A leap year.

Origin:

Origin: Late Latin bissextīlis, containing an intercalary day

Origin: , from bisextus (diēs), bis sextus (diēs)

Origin: and Latin bisextum, intercalary day

Origin: : bis, twice; see bis

Origin: + sextus, sixth (because the sixth day before the Calends of March on February 24 occurred twice every leap year); see Sext

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