Source : Webster's Revised Unabridged Dictionary (1913)

Precision \Pre*ci"sion\, n. [Cf. F. pr['e]cision, L. praecisio a
   cutting off. See {Precise}.]
   The quality or state of being precise; exact limitation;
   exactness; accuracy; strict conformity to a rule or a
   standard; definiteness.

         I have left out the utmost precisions of fractions.
                                                  --Locke.

   Syn: Preciseness; exactness; accuracy; nicety.

   Usage: {Precision}, {Preciseness}. Precision is always used
          in a good sense; as, precision of thought or language;
          precision in military evolutions. Preciseness is
          sometimes applied to persons or their conduct in a
          disparaging sense, and precise is often used in the
          same way.

Source : WordNet®

precision
     n : the quality of being reproducible in amount or performance;
         "he handled it with the preciseness of an automaton";
         "note the meticulous precision of his measurements" [syn:
          {preciseness}] [ant: {impreciseness}, {impreciseness}]

Source : Free On-Line Dictionary of Computing

precision
     
         The number of decimal places to which a number
        is computed.
     
        Compare {accuracy}.
     
        (1998-04-19)