accuracy

Etymology

* First attested in the 1660s. * accurate + -cy

noun

1. The state of being accurate; being free from error; exactness; correctness
   Its professed end [of logic], is to teach men to think, to judge, and to reason, with precision and accuracy. 1827, Thomas Reid, Essays on the Powers of the Human Mind
   The efficiency of the instrument will also depend upon the accuracy with which the piston fits the bottom and sides of the barrel. When the piston is depressed to the bottom, it is considered in theory to be in absolute contact, so as to exclude every particle of air from the space between it and the bottom. 1856, Dionysius Lardner, Popular Lectures on Science and Art
2. Exact conformity to truth, or to a rule or model; degree of conformity of a measure to a true or standard value.
   The jury doubted the accuracy of the witness' comments.