a cardinal number, ten plus one.
a symbol for this number, as 11 or XI.
a set of this many persons or things, as a football team.
amounting to eleven in number.

before 900; Middle English elleven(e), Old English ellefne, endleofan; cognate with Old High German einlif (German elf), Old Norse ellifu, Gothic ainlib-, literally, one remaining (after counting 10). See one, leave1

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eleven (ɪˈlɛvən)
1.  the cardinal number that is the sum of ten and one
2.  a numeral 11, XI, etc, representing this number
3.  something representing, represented by, or consisting of 11 units
4.  (functioning as singular or plural) a team of 11 players in football, cricket, hockey, etc
5.  Also called: eleven o'clock eleven hours after noon or midnight
6.  a.  amounting to eleven: eleven chances
 b.  (as pronoun): have another eleven today
[Old English endleofan; related to Old Norse ellefo, Gothic ainlif, Old Frisian andlova, Old High German einlif]

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

O.E. endleofan, lit. "one left" (over ten), from P.Gmc. *ainlif- (cf. Goth. ain-lif), a compound of *ain "one" + PIE *leikw- "leave, remain" (cf. Gk. leipein "to leave behind;" see relinquish). Viking survivors who escaped an Anglo-Saxon victory were daroþa laf
"the leavings of spears," while hamora laf "the leavings of hammers" was an O.E. kenning for "swords" (both from "The Battle of Brunanburgh"). Eng. twelve reflects the same formation; outside Gmc. the only instance of this formation is in Lith., which uses it all the way to 19 (vienio-lika "eleven," dvy-lika "twelve," try-lika "thirteen," keturio-lika "fourteen," etc.) Phrase eleventh hour is from Matthew xx:1-16.
FIREFLY: Give me a number from 1 to 10.
CHICOLINI: eleven!
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Take a tour down the coast to see the eleven historic lighthouses that dot the
  shores and the waterways of the state.
Until recently, the road was so terribly rutted and narrow that the trip took
  eleven hours.
Use the terms and concepts you learned about in chapter eleven.
Below are eleven boxes containing icons that represent plants, animals, and
  other major categories of living things.
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