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The Collaborative International Dictionary of English v.0.48 (gcide)

Bissextile \Bis*sex"tile\, n. [L. bissextilis annus, fr.
bissextus (bis sextus sixth, fr. sex six) the sixth of the
calends of March, or twenty-fourth day of February, which was
reckoned twice every fourth year, by the intercalation of a
day.]
Leap year; every fourth year, in which a day is added to the
month of February on account of the excess of the tropical
year (365 d. 5 h. 48 m. 46 s.) above 365 days. But one day
added every four years is equivalent to six hours each year,
which is 11 m. 14 s. more than the excess of the real year.
Hence, it is necessary to suppress the bissextile day at the
end of every century which is not divisible by 400, while it
is retained at the end of those which are divisible by 400.
[1913 Webster]


Bissextile \Bis*sex"tile\, a.
Pertaining to leap year.
[1913 Webster]

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