exactness

Concise Oxford English Dictionary © 2008 Oxford University Press:
exact/ɪɡˈzakt/

▶adjective not approximated in any way; precise.

■ accurate or correct in all details: an exact replica.

■ accurate and careful about minor details.

▶verb

• 1 demand and obtain (something) from someone.

• 2 inflict (revenge) on someone.

– derivatives
exactable adjective,
exactitude noun,
exactness noun,
exactor noun.

– origin ME (as v.): from L. exact-, exigere ‘complete, ascertain, enforce’; the adj. reflects L. exactus ‘precise’.