(1) (logic) a proposition that is not susceptible of proof or disproof; its truth is assumed to be self-evident
(2) A saying that is widely accepted on its own merits
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- A self-evident and necessary truth; a proposition which it is necessary to take for granted; a proposition whose truth is so evident that no reasoning or demonstration can make it plainer.
- A fundamental theorem that serves as a basis for deduction of other theorems. E.g., "A point has no mass; a line has no width. A plane is a flat surface with no mass and contains an infinity of points and lines".
- An established principle in some art or science that is universally received.
- The axioms of political economy cannot be considered absolute truths.