strictly accurate or correct

an exact likeness; an exact description.

precise, as opposed to approximate

the exact sum; the exact date.

admitting of no deviation, as laws or discipline; strict or rigorous.

capable of the greatest precision

exact instruments.

characterized by or using strict accuracy

an exact thinker.

Mathematics . (of a differential equation) noting that the collection of all terms, equated to zero, is an exact differential.

to call for, demand, or require

to exact respect from one's children.

to force or compel the payment, yielding, or performance of

to exact money; to exact tribute from a conquered people.

noun

carelessness , imprecision , inaccuracy , inexactness , irregularity

noun

carefulness , correctness , definiteness , definitiveness , definitude , exactitude , faithfulness , faultlessness , nicety , orderliness , painstakingness , preciseness , promptitude , regularity , rigor , rigorousness , scrupulousness , strictness , truth , unequivocalness , veracity , accuracy , fidelity , veraciousness , veridicality , verity , accurateness , precision , rightness