[doo-uhl, dyoo-]
a prearranged combat between two persons, fought with deadly weapons according to an accepted code of procedure, especially to settle a private quarrel.
any contest between two persons or parties.
verb (used with object), verb (used without object), dueled, dueling or (especially British) duelled, duelling.
to fight in a duel.

1585–95; earlier duell < Medieval Latin duellum, Latin: earlier form of bellum war, probably maintained and given sense “duel” by association with Latin duo two

duelistic; especially British, duellistic, adjective
outduel, verb (used with object), outdueled, outdueling or (especially British) outduelled, outduelling.

dual, duel.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
duel (ˈdjuːəl)
1.  a prearranged combat with deadly weapons between two people following a formal procedure in the presence of seconds and traditionally fought until one party was wounded or killed, usually to settle a quarrel involving a point of honour
2.  a contest or conflict between two persons or parties
vb , duels, duelling, duelled, duels, dueling, dueled
3.  to fight in a duel
4.  to contest closely
[C15: from Medieval Latin duellum, from Latin, poetical variant of bellum war; associated by folk etymology with Latin duo two]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 15c., from M.L. duellum "combat between two persons," by association with L. duo "two," but originally from L. duellum "war," an Old Latin form of bellum. Retained in poetic and archaic language and apparently given a special meaning in M.L. or L.L. of "one-on-one combat" on fancied connection with
duo "two." Related: Dueling.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

DUEL definition

A front end to gdb by Michael Golan mg@cs.princeton.edu. DUEL implements a language designed for debugging C programs. It features efficient ways to select and display data items. It is normally linked into the gdb executable, but could stand alone. It interprets a subset of C in addition to its own language.
Version 1.10.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
But they have prompted a running duel at the heart of government.
Each immortal acquires power by killing another immortal in a one-on-one duel.
The built-in tutorial walks you through the game, and the lowest-level duel is
  so easy it's practically a tutorial.
The new duel chemists vs physicists has ideological origin.
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