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Axiom

1. (Science: logic) 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.

2. An established principle in some art or science, which, though not a necessary truth, is universally received; as, the axioms of political economy.

Synonym: axiom, Maxim, Aphorism, Adage.

An axiom is a self-evident truth which is taken for granted as the basis of reasoning. A maxim is a guiding principle sanctioned by experience, and relating especially to the practical concerns of life. An aphorism is a short sentence pithily expressing some valuable and general truth or sentiment. An adage is a saying of long-established authority and of universal application.

Origin: L. Axioma, gr. That which is thought worthy, that which is assumed, a basis of demonstration, a principle, fr. To think worthy, fr. Worthy, weighing as much as; cf. To lead, drive, also to weigh so much: cf f. Axiome. See agent.