Meaning : Rejecting or disowning or disclaiming as invalid.
Example :
Congressional repudiation of the treaty that the President had negotiated.
Synonyms : repudiation
Meaning : An act (spoken or written) declaring that something is surrendered or disowned.
Synonyms : renouncement
Meaning : The act of renouncing. Sacrificing or giving up or surrendering (a possession or right or title or privilege etc.).
Synonyms : forgoing, forswearing