heresy heresy /ˈhɛrəsi/

noun

1. A belief that rejects the orthodox tenets of a religion  ( heresy , unorthodoxy )
   a belief that rejects the orthodox tenets of a religion
   
2. Any opinions or doctrines at variance with the official or orthodox position  ( heresy , heterodoxy , unorthodoxy )
   any opinions or doctrines at variance with the official or orthodox position