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a cardinal number, seven plus one.
a symbol for this number, as 8 or VIII.
a set of this many persons or things, as the crew of an eight-oared racing shell.
a playing card the face of which bears eight pips.
an automobile powered by an eight-cylinder engine.
an eight-cylinder engine.
amounting to eight in number.

before 1000; Middle English eighte, Old English (e)ahta; cognate with Dutch acht, Old Saxon, Old High German ahto (German acht), Old Norse ātta, Gothic ahtau, Latin octō, Greek oktṓ, Old Irish ocht, Welsh wyth, Breton eiz, Tocharian B okt, Lithuanian aštuonì, Albanian tetë, Armenian uth, Persian hasht, Sanskrit aṣṭáu; apparently an old dual in form, but not clear of what

ate, eight.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
eight (eɪt)
1.  See also number the cardinal number that is the sum of one and seven and the product of two and four
2.  a numeral, 8, VIII, etc, representing this number
3.  music the numeral 8 used as the lower figure in a time signature to indicate that the beat is measured in quavers
4.  the amount or quantity that is one greater than seven
5.  something representing, represented by, or consisting of eight units, such as a playing card with eight symbols on it
6.  rowing
 a.  a racing shell propelled by eight oarsmen
 b.  the crew of such a shell
7.  Also called: eight o'clock eight hours after noon or midnight
8.  slang have one over the eight to be drunk
9.  See figure of eight
10.  a.  amounting to eight
 b.  (as pronoun): I could only find eight
Related: octa-, octo-
[Old English eahta; related to Old High German ahto, Old Norse ātta, Old Irish ocht, Latin octō, Greek okto, Sanskrit astau]

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. eahta, æhta, from P.Gmc. *akhto(u) (cf. O.N. atta, Ger. acht, Goth. ahtau), from PIE *okto (cf. Gk. okto, L. octo, O.Ir. ocht-n, Bret. eiz, Skt. astau, Avestan ashta). Klein calls it "an old dual form, orig. meaning 'twice four.' " Meaning "eight-man crew of a rowing boat" is from 1847. The
Spanish piece of eight (1690s) was so called because it was worth eight reals. To be behind the eight ball "in trouble" (1932) is a metaphor from shooting pool.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
While as this example shows, there are different lengths of line, they are not
  all in eights and sixes.
More fun awaits you as you practice figure eights on the ice-skating rink.
Applicants must have an accredited engineering degree and a minimum of four to
  eights years of engineering experience.
The inner wall plates consist of double two by eights resting on edge.
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