bissextile

bis·sex·tile

[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) [Click for IPA pronunciation guide]
 
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]

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00:10
Bissextile is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a scrap or morsel of food left at a meal.
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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