Definition of "axiomatic"

axiomatic

/ˌæk.si.əˈmæt.ɪk/

adjective
comparative more axiomatic, superlative most axiomatic
1. Self-evident or unquestionable.
  Quotations
  The students nodded, emphatically agreeing with a statement which upwards of sixty-two thousand repetitions in the dark had made them accept, not merely as true, but as axiomatic, self-evident, utterly indisputable.
  1932, Aldous Huxley, Brave New World‎, London: Chatto & Windus
  It is axiomatic that the "physical entry of the home is the chief evil against which the wording of the Fourth Amendment is directed."
  1984, Justice William Brennan, Welsh v. Wisconsin, United States Supreme Court (66 U.S. 740, 748)
2. (mathematics) Relating to or containing axioms.