What is the meaning of repudiation?

noun

• Rejecting or disowning or disclaiming as invalid.
  • usage: "Congressional repudiation of the treaty that the President had negotiated"
  • synonyms: renunciation
• Refusal to acknowledge or pay a debt or honor a contract (especially by public authorities. )
  • usage: "the repudiation of the debt by the city"
• The exposure of falseness or pretensions.
  • usage: "the debunking of religion has been too successful"
  • synonyms: debunking