Axiom

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Axiom

(a.) A self-evident and necessary truth, or a proposition whose truth is so evident as first sight that no reasoning or demonstration can make it plainer; a proposition which it is necessary to take for granted; as, The whole is greater than a part; A thing can not, at the same time, be and not be.
(a.) An established principle in some art or science, which, though not a necessary truth, is universally received; as, the axioms of political economy.