AXIOM

[noun] [C] - a statement or principle which is generally accepted to be true, but is not necessarily soIt is a widely held axiom that governments should not negotiate with terrorists.The victorious team had skilfully demonstrated the old axiom about attack being the best form of defence.(specialized) In mathematics, science, etc., an axiom is a formal statement or principle from which other statements can be obtained.Euclid's axioms form the foundation of his system of geometry.