Heresy/ˈherəsi/ Definition 1 of 2Pro Tip 1/3Religious Context Heresy often involves rejecting church teachings or doctrine. Claiming the miracles were myths was seen as heresy. Pro Tip 2/3Historical Significance Understanding historical heresy helps grasp its severity in the past. Galileo's support for heliocentrism was a famous heresy. Pro Tip 3/3Strong Disapproval Heresy implies strong disapproval by authority or majority opinion. Denying the divine right of kings was once serious heresy.