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English definition of “heresy”

heresy

noun uk   /ˈher.ə.si/ us  
[C or U] (the act of having) an opinion or belief that is the opposite of or against what is the official or popular opinion, or an action that shows that you have no respect for the official opinion: Radical remarks like this amount to heresy for most members of the Republican party. She committed the heresy of playing a Madonna song on a classical music station. [U] a belief that is against the principles of a particular religion: He was burned at the stake for heresy in the 15th century.
(Definition of heresy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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