apostasy

Definition of Apostasy in English :

the state of having rejected your religious beliefs or your political party or a cause (often in favor of opposing beliefs or causes)

2. apostasy, tergiversation

the act of abandoning a party for cause

WordNet Lexical Database for English. Princeton University. 2010.

Apostasy

noun plural -sies

abandonment of one's religious faith, party, a cause, etc

nounWord forms: plural aˈpostasies

an abandoning of what one has believed in, as a faith, cause, or principles

n. pl. a·pos·ta·sies

Abandonment of one's religious faith, a political party, one's principles, or a cause.