noun (n)

• a statement asserting the existence or the truth of something(noun.communication)

  Synonym:
  avouchment, avowal
  

  source: wordnet30
• the act of affirming or asserting or stating something(noun.communication)

  Synonym:
  assertion, statement
  

  source: wordnet30
• (religion) a solemn declaration that serves the same purpose as an oath (if an oath is objectionable to the person on religious or ethical grounds)(noun.communication)

  source: wordnet30
• a judgment by a higher court that the judgment of a lower court was correct and should stand(noun.act)

  Antonym:
  reversal
  

  source: wordnet30
• Confirmation of anything established; ratification; as, the affirmation of a law.(noun)

  source: webster1913