repudiation, renunciation -- (rejecting or disowning or disclaiming as invalid; "Congressional repudiation of the treaty that the President had negotiated")
apostasy, renunciation, defection -- (the state of having rejected your religious beliefs or your political party or a cause (often in favor of opposing beliefs or causes))
renunciation, renouncement -- (an act (spoken or written) declaring that something is surrendered or disowned)
renunciation, forgoing, forswearing -- (the act of renouncing; sacrificing or giving up or surrendering (a possession or right or title or privilege etc.))
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