Meaning

noun a saying that is widely accepted on its own merits

noun (logic) a proposition that is not susceptible of proof or disproof; its truth is assumed to be self-evident

originFrom Middle French axiome in the 15th century, from Latin axiōma (“axiom; principle”), from Ancient Greek ἀξίωμα (axíōma, “that which is thought to fit, a requisite, that which a pupil is required to know beforehand, a self-evident principle”), from ἀξιόω (axióō, “to think fit or worthy, to require, to demand”), from ἄξιος (áxios, “fit, worthy”, literally “weighing as much as; of like value”),…

Etymology from Wiktionary, CC BY-SA 3.0