heresy
//ˈhɛrəsi//
Noun
heresySingular
heresiesPlural
1
A belief or opinion that contradicts established religious doctrine or orthodox teachings, especially one formally condemned by a church.
In the Middle Ages, those accused of heresy were often punished severely by the church.
2
An opinion or belief that strongly opposes what is generally accepted or established, especially in a particular field or discipline.
Suggesting that the earth was not the center of the universe was once considered heresy in the scientific community.