From Middle English heresie, from Old French heresie (modern hérésie), from Latin haeresis, from Ancient Greek αἵρεσις ("choice, system of principles"), from αἱρέομαι, the middle voice of αἱρέω, possibly from Proto-Indo-European *ser-; see also Welsh herw ("theft, raid"), Ancient Greek στερέω ("to deprive of").
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