accuracy

noun

closeness of a test result to the accepted reference value
closeness of the mean of a large set of measurement to the accepted reference value
the ability of a diagnostic test to correctly classify the presence or absence of the target disorder

Pronunciation: /ˈak.jʊ.ɹə.si/ / /ˈak.jə.ɹə.si/ / /ˈæk.jɚ.ə.si/

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

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.”
“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.”
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.”