bissextile

[bahy-seks-til, -tahyl, bi-]
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adjective

containing or noting the extra day of leap year: The years 1980 and 1984 were both bissextile.

noun


Origin of bissextile

1585–95; < Late Latin bi(s)sextilis (annus) leap year, equivalent to bissext(us) bissextus + -ilis -ile
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for bissextile

bissextile

adjective

(of a month or year) containing the extra day of a leap year

noun

a rare name for leap year

Word Origin for bissextile

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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