apos·ta·sy /əˈpɑstəsi/
  背教,變節,脫黨
  A·pos·ta·sy n.; pl. Apostasies   An abandonment of what one has voluntarily professed; a total desertion of departure from one's faith, principles, or party; esp., the renunciation of a religious faith; as, Julian's apostasy from Christianity.
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  apostasy
       n 1: the state of having rejected your religious beliefs or your
            political party or a cause (often in favor of opposing
            beliefs or causes) [syn: renunciation, defection]
       2: the act of abandoning a party or cause [syn: tergiversation]