exactness

1. The condition of being exact; accuracy; nicety; precision; regularity; as, exactness of judgement or deportment.

2. Careful observance of method and conformity to truth; as, exactness in accounts or business.

He had . . . that sort of exactness which would have made him a respectable antiquary.

Definition: accuracy, precision
Antonyms: carelessness, imprecision, inaccuracy, inexactness, irregularity