What is the meaning of denial?

noun

• The act of refusing to comply (as with a request. )
  • usage: "it resulted in a complete denial of his privileges"
• The act of asserting that something alleged is not true.
  • synonyms: disaffirmation
• Psychiatry) a defense mechanism that denies painful thoughts. (
• Renunciation of your own interests in favor of the interests of others.
  • synonyms: abnegation, self-abnegation, self-denial, self-renunciation
• A defendant's answer or plea denying the truth of the charges against him.
  • usage: "he gave evidence for the defense"
  • synonyms: defense, defence, demurrer