English to English

noun (n)

• additional proof that something that was believed (some fact or hypothesis or theory) is correct(noun.cognition)

  Synonym:
  check, confirmation, substantiation
  

  source: wordnet30
• (law) an affidavit attached to a statement confirming the truth of that statement(noun.communication)

  source: wordnet30
• The act of verifying, or the state of being verified; confirmation; authentication.(noun)

  source: webster1913