renunciation

If you reject something or disown it, you can call this renunciation. Sorry, your renunciation of your membership in the American Association of Retired People will not make you any younger.

Use the noun renunciation especially when you mean you have given up your religious or political beliefs or some cause you previously supported. When you drop a political party to become an independent, you mean it to be a renunciation of all the infighting, backstabbing, and finger pointing that have become "politics as usual."

Definitions of renunciation
  1. noun
    the act of renouncing; sacrificing or giving up or surrendering (a possession or right or title or privilege etc.)
    synonyms: forgoing, forswearing
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    types:
    forsaking, giving up
    the act of forsaking
    abnegation, denial, self-abnegation, self-denial, self-renunciation
    renunciation of your own interests in favor of the interests of others
    type of:
    rejection
    the act of rejecting something
  2. noun
    an act (spoken or written) declaring that something is surrendered or disowned
    synonyms: renouncement
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    types:
    relinquishing, relinquishment
    a verbal act of renouncing a claim or right or position etc.
    giving up, surrender, yielding
    a verbal act of admitting defeat
    type of:
    resignation
    the act of giving up (a claim or office or possession etc.)
  3. noun
    rejecting or disowning or disclaiming as invalid
    synonyms: repudiation
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    types:
    disclaimer
    (law) a voluntary repudiation of a person's legal claim to something
    disowning, disownment
    refusal to acknowledge as one's own
    type of:
    rejection
    the speech act of rejecting
  4. noun
    the state of having rejected your religious beliefs or your political party or a cause (often in favor of opposing beliefs or causes)
    synonyms: apostasy, defection
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    type of:
    rejection
    the state of being rejected
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