bissextile Hear it!

bissextile definition

bis·sex·tile (bis seks′til, -təl, -tīl′)

adjective

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

Etymology: 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

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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