axiom

/ˈæksiəm/
noun
  1. A statement or idea that is generally accepted as true without needing proof.
    • In geometry, one axiom is that a straight line is the shortest distance between two points.
    • It is a basic axiom of business that you must spend money to make money.
    • The old axiom 'time heals all wounds' is often quoted to comfort people.
  2. A rule or principle that most people agree with and use as a basis for reasoning.
    • In her philosophy class, she learned that every argument starts from a fundamental axiom.
    • The axiom 'honesty is the best policy' guides many people's decisions.
    • The coach's favorite axiom was 'practice makes perfect.'
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