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bissextile

[bahy-seks-til, -tahyl, bi-] /baɪˈsɛks tɪl, -taɪl, bɪ-/
adjective
1.
containing or noting the extra day of leap year:
The years 1980 and 1984 were both bissextile.
noun
2.
Origin
1585-1595
1585-95; < Late Latin bi(s)sextilis (annus) leap year, equivalent to bissext(us) bissextus + -ilis -ile
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for bissextile

bissextile

/bɪˈsɛkstaɪl/
adjective
1.
(of a month or year) containing the extra day of a leap year
noun
2.
a rare name for leap year
Word Origin
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for bissextile

1580s (n.); 1590s (adj.), in reference to Roman leap year, from Late Latin (annus) bissextilis "leap year," literally "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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