ac·cu·ra·cy

[ak-yer-uh-see]
noun, plural ac·cu·ra·cies.
1.
the condition or quality of being true, correct, or exact; freedom from error or defect; precision or exactness; correctness.
2.
Chemistry, Physics. the extent to which a given measurement agrees with the standard value for that measurement. Compare precision ( def 6 ).
3.
Mathematics. the degree of correctness of a quantity, expression, etc. Compare precision ( def 5 ).

Origin:
1655–65; accur(ate) + -acy

hy·per·ac·cu·ra·cy, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
accuracy (ˈækjʊrəsɪ) [Click for IPA pronunciation guide]
 
n , pl -cies
1.  faithful measurement or representation of the truth; correctness; precision
2.  physics, chem the degree of agreement between a measured or computed value of a physical quantity and the standard or accepted value for that quantity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Accuracy is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
FOLDOC
Computing Dictionary

accuracy definition

mathematics
How close to the real value a measurement is.
Compare precision.
(1998-04-19)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
But his robust good sense, his regard for strict accuracy and his determination
  to be understood, make him an interesting writer.
We take great pride in knowing that nothing appears in the magazine without
  being checked for accuracy and balance.
Since text often persists over many frames, the software also looks for text
  similarity among frames to increase accuracy.
As the war drags on, the intensity and accuracy of those attacks has increased.
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