From Longman Dictionary of Contemporary Englishaxiomax‧i‧om /ˈæksiəm/ noun [countable] formalTRUE a rule or principle that is generally considered to be true
Examples from the Corpus
axiom• Most of his axioms were unconditional.• Each subject has its own painful application of this misdirected axiom.• For the San Francisco 49ers, however, that axiom will change Saturday, particularly in the right guard position.• The axiom is that these novels are the first to be written.• Two axioms underwrite Sereny's tireless sleuthing.Origin axiom (1400-1500) Latin axioma, from Greek, “honor”, from axios “worth, worthy” 