apostasy
1. [ 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: defection renunciation
Related terms: rejection defect
2. [ noun ] the act of abandoning a party or cause
Synonyms: tergiversation
Related terms: abandonment apostatize
Similar spelling:   apostate
  apostatize
  apostatise
  Apostle
  apostleship