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Definition of bissextile


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bis·sex·tile  audio  (b-skstl, -stl, b-) KEY 

ADJECTIVE:
  1. Of or relating to a leap year.
  2. Of or relating to the extra day falling in a leap year.
NOUN:
A leap year.

ETYMOLOGY:
Late Latin bissextlis, containing an intercalary day, from bisextus (dis), bis sextus (dis), 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


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