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heresy

heresy: listen to American pronunciation/ˈher·ə·si/ n [C/U]

Definition

a belief opposed to the official belief of a church and that is considered wrong, or the condition of having such beliefs:
[U] fig. The concept of college athletes being paid to play sports was received as nothing short of heresy (= unusual opinions considered completely wrong).
(Definition of heresy n from the Cambridge Academic Content Dictionary © Cambridge University Press)

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