Inaccuracy \In*ac"cu*ra*cy\, n.; pl. {Inaccuracies}. [1913 Webster] 1. The quality of being inaccurate; lack of accuracy or exactness. [1913 Webster] 2. That which is inaccurate or incorrect; mistake; fault; defect; error; as, in inaccuracy in speech, copying, calculation, etc. [1913 Webster]