bissextile

bissextile

[bahy-seks-til, -tahyl, bi-]
adjective
1.
containing or noting the extra day of leap year: The years 1980 and 1984 were both bissextile.
noun

Origin:
1585–95; < Late Latin bi(s)sextilis (annus) leap year, equivalent to bissext(us) bissextus + -ilis -ile

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World English Dictionary
bissextile (bɪˈsɛkstaɪl)
 
adj
1.  (of a month or year) containing the extra day of a leap year
 
n
2.  a rare name for leap year
 
[C16: from Late Latin bissextilis annus leap year, from Latin bissextus, from bi-1 + sextus sixth; referring to February 24, the 6th day before the Calends of March]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

bissextile
Roman leap year, L.L. (annus) bissextilis "leap year," lit. "the twice sixth-day," because the sixth day before the Calends of March was doubled.
Online Etymology Dictionary, © 2010 Douglas Harper
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