The Collaborative International Dictionary of English v.0.48:

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]

WordNet (r) 3.0 (2006):

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"

The Free On-line Dictionary of Computing (19 January 2023):

accuracy

    How close to the real value a measurement is.

   Compare precision.

   (1998-04-19)