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1. Rejecting, disowning or disclaiming as invalid
   "Congressional renunciation of the treaty that the President had negotiated";
   - repudiation
    
2. The state of having rejected your affiliation, religious or political beliefs, or principles (often in favour of opposing beliefs or causes)
   - apostasy, defection
    
3. An act (spoken or written) declaring that something is surrendered or disowned
   - renouncement
    
4. The act of renouncing; sacrificing or giving up or surrendering (a possession or right or title or privilege etc.)
   - forgoing, forswearing

Derived forms: renunciations

Type of: rejection, resignation

Encyclopedia: Renunciation