From WordNet (r) 3.0 (2006) [wn]:
accuracy
n 1: the quality of being near to the true value; "he was
beginning to doubt the accuracy of his compass"; "the
lawyer questioned the truth of my account" [syn:
accuracy, truth] [ant: inaccuracy]
2: (mathematics) the number of significant figures given in a
number; "the atomic clock enabled scientists to measure time
with much greater accuracy"
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Accuracy \Ac"cu*ra*cy\ (#; 277), n. [See Accurate.]
The state of being accurate; freedom from mistakes, this
exemption arising from carefulness; exact conformity to
truth, or to a rule or model; precision; exactness; nicety;
correctness; as, the value of testimony depends on its
accuracy.
[1913 Webster]
The professed end [of logic] is to teach men to think,
to judge, and to reason, with precision and accuracy.
--Reid.
[1913 Webster]
The accuracy with which the piston fits the sides.
--Lardner.
[1913 Webster]
From The Free On-line Dictionary of Computing (8 July 2008) [foldoc]:
accuracy
<mathematics> How close to the real value a measurement is.
Compare precision.
(1998-04-19)