Meaning

adjective marked by strict and particular and complete accordance with fact

adjective (of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth ; strictly correct

originEtymology tree English exact Proto-Indo-European *-yōs Proto-Indo-European *-tHós Proto-Indo-European *-istHos Proto-Germanic *-istaz Proto-West Germanic *-ist Old English -est Middle English -est English -est English exactest From exact + -est.

Etymology from Wiktionary, CC BY-SA 3.0