These are the terms associated with measurement of static parameters i.e parameters that change slowly with time.
Accuracy is one of those.
Accuracy determines the closeness of an instrument reading to the true value of measured parameter.
More close to true value more is accuracy.
There is another term called precision .
It is related to repeatability of the instrument.
For eg, if true value of measured parameter is 150.
If measured values are:
Which means data is not accurate but precise(repeatability is good).
c= Calibration error
So for instrument to be accurate it is necessary that it should be precise alongwith that it should be calibrated well to give correct value.