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Noun: apostasy  u'pós-tu-see
  1. The state of having rejected your affiliation, religious or political beliefs, or principles (often in favour of opposing beliefs or causes)
    - renunciation, defection
  2. The act of abandoning a party for cause
    - tergiversation

Derived forms: apostasies

Type of: abandonment, desertion, forsaking, rejection

Encyclopedia: Apostasy