Exactitude, precision (8)
I believe the answer is:
accuracy
I believe this is a double definition.
'exactitude' is the first definition.
(thesaurus)
'precision' is the second definition.
(I've seen this before)
(Other definitions for accuracy that I've seen before include "Precision of detail" , "Correctness, nearness to truth" , "Correctness, precision" , "Truthfulness" , "Absolute correctness" .)