Source : Webster's Revised Unabridged Dictionary (1913)

Inaccuracy \In*ac"cu*ra*cy\, n.; pl. {Inaccuracies}.
   1. The quality of being inaccurate; want of accuracy or
      exactness.

   2. That which is inaccurate or incorrect; mistake; fault;
      defect; error; as, in inaccuracy in speech, copying,
      calculation, etc.