) KEY NOUN: pl. her·e·sies
- An opinion or a doctrine at variance with established religious beliefs, especially dissension from or denial of Roman Catholic dogma by a professed believer or baptized church member.
- Adherence to such dissenting opinion or doctrine.
- A controversial or unorthodox opinion or doctrine, as in politics, philosophy, or science.
- Adherence to such controversial or unorthodox opinion.
Middle English heresie
, from Old French, from Late Latin haeresis
, from Late Greek hairesis
, from Greek, a choosing, faction
, from haireisthai
, to choose
, middle voice of hairein
, to take