What does the word refute mean?

Usage examples for refute

  1. I distinctly felt called upon to refute it. – A Fool and His Money by George Barr McCutcheon
  2. Hugh sat up, eager to refute this criticism. – The Safety Curtain, and Other Stories by Ethel M. Dell
  3. I have not one witness who can refute this testimony." – The Lost Despatch by Natalie Sumner Lincoln