Apostasy
Apostasy ({not transcribed}) , noun
[Old English apostasie, French apostasie, Latin apostasia, from Greek {not transcribed} a standing off from, a defection, from {not transcribed} to stand off, revolt; {not transcribed} from + {not transcribed} to stand. See Off and Stand.]
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.