noun (n)

• any evidence that helps to establish the falsity of something(noun.cognition)

  Synonym:
  falsification, refutation
  

  source: wordnet30
• the act of determining that something is false(noun.act)

  Synonym:
  falsification, falsifying, refutal, refutation
  

  source: wordnet30
• A proving to be false or erroneous; confutation; refutation; as, to offer evidence in disproof of a statement.(noun)

  source: webster1913