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n (philosophy) A seemingly (l/en|self-evident) or necessary (l/en|truth) which is based on (l/en|assumption); a (l/en|principle) or (l/en|proposition) which cannot actually be proved or disproved.

n (mathematics|logic|(w|proof theory)) A fundamental (l/en|theorem) that serves as a basis for (l/en|deduction) of other theorems. Examples: "Through a pair of distinct points there passes exactly one straight line", "All right angles are congruent".

n An established principle in some artistic practice or science that is universally received.