noun (n)

• the act of refusing to comply (as with a request)(noun.communication)

  Example:
  It resulted in a complete denial of his privileges.
  

  source: wordnet30
• the act of asserting that something alleged is not true(noun.communication)

  Synonym:
  disaffirmation
  

  source: wordnet30
• (psychiatry) a defense mechanism that denies painful thoughts(noun.process)

  source: wordnet30
• renunciation of your own interests in favor of the interests of others(noun.act)

  Synonym:
  abnegation, self-abnegation, self-denial, self-renunciation
  

  source: wordnet30
• a defendant's answer or plea denying the truth of the charges against him(noun.act)

  Synonym:
  defence, defense, demurrer
  Antonym:
  criminal prosecution, prosecution
  

  source: wordnet30
• The act of gainsaying, refusing, or disowning; negation; -- the contrary of affirmation.(noun)

  source: webster1913