noun (n)

• the quality of being near to the true value(noun.attribute)

  Example:
  He was beginning to doubt the accuracy of his compass.
  

  Synonym:
  truth
  Antonym:
  inaccuracy
  

  source: wordnet30
• (mathematics) the number of significant figures given in a number(noun.attribute)

  Example:
  The atomic clock enabled scientists to measure time with much greater accuracy.
  

  source: wordnet30
• 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.(noun)

  source: webster1913