Meaning

verb claim as due or just

verb take as an undesirable consequence of some event or state of affairs

adjective marked by strict and particular and complete accordance with fact

originFrom Latin exāctus (the verb via Middle English exact), perfect passive participle of exigō (“demand, claim as due; measure by a standard, weigh, test”), from ex (“out”) + agō (“drive”).

Etymology from Wiktionary, CC BY-SA 3.0