exact (adj.) Look up exact at Dictionary.com
"precise, rigorous, accurate," 1530s, from L. exactus, pp. of exigere, lit. "to drive or force out," also "demand, finish, measure," from ex- "out" + agere "drive, lead, act" (see act). The verb (late 14c., implied in exaction) is older in English and represents the literal sense of the Latin. Related: Exacted.