Adjective : The years 1980 and 1984 were both bissextile.    From Dictionary.com. 

About the last gasp for distinctively bissextile drinks was the '70s.    From Wordnik.com.  [How to toast the leap year] Reference

Eugene Volokh • May 12, 2010 9:42 pm that I am bissextile, frombirth.    From Wordnik.com.  [The Volokh Conspiracy » I Should Note for the Record] Reference

Eugene Volokh • May 12, 2010 9: 42 pm that I am bissextile, frombirth.    From Wordnik.com.  [The Volokh Conspiracy » I Should Note for the Record] Reference

Mr. Schwilgué has even indicated the suppression of the secular bissextile days.    From Wordnik.com.  [Historical Sketch of the Cathedral of Strasburg] Reference

The fourth year was bissextile, and the dominical letters were F, E; the following year D, and so on.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

Does that mean that I am semi or maybe demi bissextile for having been born halfway between two leap years?.    From Wordnik.com.  [The Volokh Conspiracy » I Should Note for the Record] Reference

Does that mean that I am semi (or maybe demi) bissextile for having been born halfway between two leap years?.    From Wordnik.com.  [The Volokh Conspiracy » I Should Note for the Record] Reference

Oh yes, the official name of February 29th is ‘bissextile day’, the 60th day of Gregorian calendar in such a year, with 306 days remaining until the end of that year.    From Wordnik.com.  [Leap Day Superstitions Rock Gender Roles] Reference

Its adoption upon our present Gregorian calendar would only require the suppression of the usual bissextile once in every 128 years, and there would be no necessity for any further correction, as the error is so insignificant that it would not amount to a day in 100,000 years.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

The bissextile is known to have been used by the Mayas.    From Wordnik.com.  [Ancient America, in Notes on American Archaeology] Reference

"B" stands for "bissextile," which indicators the 4th, and thus leap year.    From Wordnik.com.  [Luxist] Reference

The whole acre divided into four denotes the bissextile period of four years.    From Wordnik.com.  [The Ruins, or, Meditation on the Revolutions of Empires and the Law of Nature] Reference

I refer you to Montucla, if you have any doubt about the Egyptian year being of 365 days without bissextile of any kind.    From Wordnik.com.  [Personal Recollections, from Early Life to Old Age, of Mary Somerville] Reference

These are subtracted every hundred years by not taking as bissextile those secular years of which the radical is not divisible by four.    From Wordnik.com.  [Astronomy for Amateurs] Reference

This rule of the bissextile year, Rome, which is destined to endure to the end of time, established with the aid of the heavenly Deity.    From Wordnik.com.  [The Roman History of Ammianus Marcellinus During the Reigns of the Emperors Constantius, Julian, Jovianus, Valentinian, and Valens] Reference

If I were not above the temptation, I could pen you a dozen of the latter every ordinary year, and thirteen, perhaps, in the bissextile.    From Wordnik.com.  [Olla Podrida] Reference

Their knowledge of heavenly bodies was limited; they knew the bissextile, and used a rude correction, but had no astronomical instruments.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 2: Assizes-Browne] Reference

On the other hand, however, to make the calendar more nearly agree with the sun's course, every fourth hundred year is still considered bissextile.    From Wordnik.com.  [Amusements in Mathematics] Reference

The lower classes calculate, purely by the mind without any help from pen or pencil, questions respecting interest; determine whether a given year be bissextile or not, &c. &c.    From Wordnik.com.  [The Uncollected Writings of Thomas de Quincey—Vol. 1 With a Preface and Annotations by James Hogg] Reference

Every year that can be divided by four without a remainder is bissextile or leap year, with the exception that one leap year is cut off in the century. 1800 was not a leap year, nor was 1900.    From Wordnik.com.  [Amusements in Mathematics] Reference

Consequently, since this extra day in February every fourth year is an essential part of the lunar calendar, the new moons will occur one day later in the non-bissextile centurial years than indicated by the.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 5: Diocese-Fathers of Mercy] Reference

Positivist Calendar, in which every day was dedicated to some benefactor of humanity (generally with the addition of a similar but minor luminary, to be celebrated in the room of his principal each bissextile year).    From Wordnik.com.  [Auguste Comte and Positivism] Reference

The Hysek X-RAY Perpetual Calendar features months and bissextile leap year indication at 12 o†™ Clock, date indication at 3 O†™ clock, day counter at 9 o†™ clock and second GMT indication at 6 o†™ clock.    From Wordnik.com.  [Wrist Dreams] Reference

Accordingly, completing their reckoning of a cycle at the sign of Two Canes, they counted an Age, which is a period of fifty-two years, because, on account of the bissextile years which necessarily fell in this sign of the Cane, it occurred at the expiration of every period of fifty-two years.    From Wordnik.com.  [Notes on Certain Maya and Mexican Manuscripts Third Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1881-82, Government Printing Office, Washington, 1884, pages 3-66] Reference

In order to simplify the calendar, this accumulating fraction of five hours, forty-eight minutes, forty-six seconds (about a quarter day) is added every four years to a bissextile year (leap-year), and thus we have uneven years of three hundred and sixty-five, and three hundred and sixty-six days.    From Wordnik.com.  [Astronomy for Amateurs] Reference

February moons are not properly indicated is immaterial in a system whose sole object is to indicate as nearly as practicable the fourteenth day of the moon after 21 March, the subtraction of one from the Epacts takes place at the beginning of all non-bissextile centurial years and is known as the Solar equation.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 5: Diocese-Fathers of Mercy] Reference

The second-mentioned number of days being used, in each case, whenever the following or new Gregorian year is bissextile.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

When Valentinian arrived in answer to the summons he had received, either in obedience to omens which guided him in the prosecution of the affair, as was generally thought, or to repeated warnings conveyed in dreams, he would not come into public or be seen by any one for two days, because he wished to avoid the bissextile day of February which came at that time, and which he knew to have been often an unfortunate day for the Roman empire: of this day I will here give a plain explanation.    From Wordnik.com.  [The Roman History of Ammianus Marcellinus During the Reigns of the Emperors Constantius, Julian, Jovianus, Valentinian, and Valens] Reference

Some of my best friends are bissextile.    From Wordnik.com.  [The Volokh Conspiracy » I Should Note for the Record] Reference

3900, 4300, 4600, etc. A second disturbance of the Epacts is caused by the occurrence of the non-bissextile centurial years.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 5: Diocese-Fathers of Mercy] Reference

Next bissextile year Acura need make a.    From Wordnik.com.  [xml's Blinklist.com] Reference

The bissextile day.    From Wordnik.com.  [The Standard Speller; Containing Exercises for Oral Spelling; also, Sentences for Silent Spelling by Writing from Dictation. In Which the Representative Words and the Anomalous Words of the English Language are so Classified as to Indicate Their Pronunciation, and to be Fixed in the Memory by Association.] Reference

20. bissextile.    From Wordnik.com.  [A Spelling-Book for Advanced Classes] Reference

As usual the OED transcriptions are hopelessly inconsistent; apparently quintile is usually /-ɪl/ in the UK, while quartile is always /-aɪl/ and /-ɪl/ for the Americans; sextile is /-aɪl/ both sides of the Atlantic but bissextile is /-ɪl-/ with no mention of America these entries make a nice study in the utter chaos of OED’s phons!.    From Wordnik.com.  [1880s English | Linguism | Language Blog] Reference