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

the quality of being inaccurate and having errors

The difference between the input quantity applied to a measuring instrument and the output quantity indicated by the instrument. The inaccuracy of an instrument is equal to the sum of its instrument error and its uncertainty.

The quality of being inaccurate; lack of accuracy or exactness.