next after the tenth; being the ordinal number for 11.
being one of 11 equal parts.
an eleventh part, especially of one (1/11).
the eleventh member of a series.

before 1000; Middle English enleventh, enlefte, Old English endlyfta (akin to Old Frisian andlofta, Old Saxon ellifto). See eleven, -th2

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World English Dictionary
eleventh (ɪˈlɛvənθ)
1.  (usually prenominal)
 a.  coming after the tenth in numbering or counting order, position, time, etc; being the ordinal number of eleven: often written 11th
 b.  (as pronoun): the eleventh in succession
2.  a.  one of 11 equal or nearly equal parts of an object, quantity, measurement, etc
 b.  (as modifier): an eleventh part
3.  the fraction equal to one divided by 11 (1/11)
4.  music
 a.  an interval of one octave plus one fourth
 b.  See eleventh chord

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
But no one knows whether these eleventh-hour efforts will succeed.
Any agreement that emerges from eleventh-hour negotiations may involve still further reductions.
Scrutiny of the craft's images later led to the identification of an eleventh inner moon.
On the eleventh day, the rats were killed and examined.
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