Precisely agreeing with a standard, a fact, or the truth; perfectly conforming; neither exceeding nor falling short in any respect.

(transitive, intransitive) To demand and enforce the payment or performance of, sometimes in a forcible or imperious way. / (transitive) To make desirable or necessary.

exactly

The act of demanding with authority, and compelling to pay or yield; compulsion to give or furnish; a levying by force / extortion.

The process of exacting something; exaction.

plural of exactment

exacting

The quality of being exactive.

(algebra) A sequence of groups with adjacent groups connected by homomorphisms such that the image of one homomorphism is the kernel of the next.

plural of exact science