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| 1. | a self-evident truth that requires no proof. |
| 2. | a universally accepted principle or rule. |
| 3. | Logic, Mathematics. a proposition that is assumed without proof for the sake of studying the consequences that follow from it. |

| axiom (āk'sē-əm) Pronunciation Key
A principle that is accepted as true without proof. The statement "For every two points P and Q there is a unique line that contains both P and Q" is an axiom because no other information is given about points or lines, and therefore it cannot be proven. Also called postulate. |