The meaning of HERETIC is a person who differs in opinion from established religious dogma; specifically : a baptized member of the Roman Catholic Church who refuses to acknowledge or accept a truth made known through divine inspiration. How to use heretic in a sentence. Heresy is any belief or theory that is strongly at variance with established beliefs or customs, particularly the accepted beliefs or religious law of a religious organization. [1][2] A heretic is a proponent of a heresy. [1] us / ˈher·əˌtɪk / a person who has beliefs that are opposed to the official belief of a church and that the church considers wrong (Definition of heretic from the Cambridge Academic Content Dictionary © Cambridge University Press) The noun hereticis mostly used in a religious context to talk about someone whose actions or beliefs act against the laws, rules, or beliefs of some specific religion. However, hereticcan also be used in a non-religious way to mean someone whose ideas go against the norm. heretic (noun) heretic / ˈ herəˌtɪk/ noun plural heretics Britannica Dictionary definition of HERETIC [count] : someone who believes or teaches something that goes against accepted or official beliefs Define heretic. heretic synonyms, heretic pronunciation, heretic translation, English dictionary definition of heretic. n. A person who holds controversial opinions, especially one who publicly dissents from the officially accepted dogma of the Roman Catholic Church. HERETIC definition: a professed believer who maintains religious opinions contrary to those accepted by their church or rejects doctrines prescribed by that church. See examples of heretic used in a sentence. Heretic: a professed believer who maintains religious opinions contrary to those accepted by his or her church or rejects doctrines prescribed by that church. Heresy is any belief or theory that is strongly at variance with established beliefs or customs, in particular the accepted beliefs of a church or religious organization. The term is usually used in reference to violations of important religious teachings, but is also used of views strongly opposed to any generally accepted ideas. A heretic is someone whose beliefs or actions are considered wrong by most people, because they disagree with beliefs that are generally accepted. He was considered a heretic and was ridiculed and ostracized for his ideas.