Meaning

noun any opinions or doctrines at variance with the official or orthodox position

noun a belief that rejects the orthodox tenets of a religion

originFrom Middle English heresie (Middle English her(esie) + -esy), from Old French heresie (modern hérésie), from Latin haeresis, from Ancient Greek αἵρεσις (haíresis, “choice, system of principles”), from αἱρέομαι (hairéomai, “to take for oneself, to choose”), the middle voice of αἱρέω (hairéō, “to take”), possibly from Proto-Indo-European *ser-; see also Welsh herw (“theft, raid”), Ancient Greek…

Etymology from Wiktionary, CC BY-SA 3.0