Definition of "duello"

Come ſir Andrew, there's no remedie, the Gentleman will for his honors ſake haue one bowt with you: he cannot by the Duello avoide it: but hee has promiſed me, as he is a Gentleman and a Soldiour, he will not hurt you.

c. 1601–1602 (date written), William Shakespeare, “Twelfe Night, or What You Will”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene iv], page 269, column 2

the duello or monomachia

1814 July 7, [Walter Scott], Waverley; or, ’Tis Sixty Years Since. […], volumes (please specify |volume=I to III), Edinburgh: […] James Ballantyne and Co. for Archibald Constable and Co.; London: Longman, Hurst, Rees, Orme, and Brown

The native State of Patrick Henry Hanway was a moss-grown member of the republic and had been one of the original thirteen. It possessed with other impedimenta a moss-grown aristocracy that borrowed money, devoured canvasbacks, drank burgundy, wore spotless tow in summer, clung to the duello, and talked of days of greatness which had been before the war.

1904, Alfred Henry Lewis, “How a President is Bred”, in The President: A Novel, New York, N.Y.: A[lfred] S[mith] Barnes and Company, page 24