Axiomatic means so obviously true that it needs no proof. It is axiomatic that, an axiomatic truth, treat it as axiomatic.
In mathematics an axiom is a starting point assumed without proof, and everything else is built on it. In ordinary speech, calling something axiomatic is a claim that argument is unnecessary, which is not always fair.
1adjectiveaxiomaticSo obviously true that it needs no proof.
“It is axiomatic in the trade that the customer never reads the manual.”
axiomatic is a quality.
Greek axiomatikos comes from axioma, a thing thought worthy, from axios, worthy.
Ancient Greek
ἀξιωμᾰτικός — employing logical propositions
English, today
axiomatic
From Ancient Greek ἀξιωμᾰτικός (“employing logical propositions”), from ἀξίωμα + -ικός, equivalent to axiom + -atic.
Etymology from Wiktionary, CC BY-SA