Accuracy (noun)

The degree to which the result of a measurement, calculation, or specification conforms to the correct value or a standard.

Origin:

Late middle english (in the sense "exactness, correctness"): from old french acurateté, from late latin accuratetas, from the stem of latin accuratus "done with care", past participle of accurare "take care of".

Examples:

1. The accuracy of the instrument was checked.
2. The accuracy of his account could not be verified.
3. The gun's accuracy was greatly improved by the new sights.
4. He is known for the accuracy of his predictions.
5. The test results were checked for accuracy.