noun, plural accuracies.
the condition or quality of being true, correct, or exact; freedom from error or defect; precision or exactness; correctness.
Chemistry, Physics. the extent to which a given measurement agrees with the standard value for that measurement. Compare precision ( def 6 ).
Mathematics. the degree of correctness of a quantity, expression, etc. Compare precision ( def 5 ).

1655–65; accur(ate) + -acy

hyperaccuracy, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
accuracy (ˈækjʊrəsɪ)
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
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Computing Dictionary

accuracy definition

How close to the real value a measurement is.
Compare precision.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Pendulums, springs, tuning forks and piezoelectric crystals have all been
  pressed into service with varying degrees of accuracy.
In many ways, myths cannot really be translated with any accuracy from their
  native soil—from their own place and time.
Heavy media coverage and folk beliefs are not equivalent to accuracy.
We strive to maintain the accuracy of all information presented here, and we
  encourage readers to help us in that effort.
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