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From The Collaborative International Dictionary of English v.0.48:
Heterodoxy \Het"er*o*dox`y\, n. [Gr. ?: cf. F. h['e]t['e]rodoxie.] An opinion or doctrine, or a system of doctrines, contrary to some established standard of faith, as the Scriptures, the creed or standards of a church, etc.; heresy. --Bp. Bull. [1913 Webster]