n.; pl. Heresies [ OE. heresie, eresie, OF. heresie, iresie, F. hérésie, L. haeresis, Gr. &unr_; a taking, a taking for one's self, choosing, a choice, a sect, a heresy, fr. &unr_; to take, choose. ] [ 1913 Webster ]

1. An opinion held in opposition to the established or commonly received doctrine, and tending to promote a division or party, as in politics, literature, philosophy, etc.; -- usually, but not necessarily, said in reproach. [ 1913 Webster ]

New opinions
Divers and dangerous, which are heresies,
And, not reformed, may prove pernicious. Shak. [ 1913 Webster ]

After the study of philosophy began in Greece, and the philosophers, disagreeing amongst themselves, had started many questions . . . because every man took what opinion he pleased, each several opinion was called a heresy; which signified no more than a private opinion, without reference to truth or falsehood. Hobbes. [ 1913 Webster ]

2. (Theol.) Religious opinion opposed to the authorized doctrinal standards of any particular church, especially when tending to promote schism or separation; lack of orthodox or sound belief; rejection of, or erroneous belief in regard to, some fundamental religious doctrine or truth; heterodoxy. [ 1913 Webster ]

Doubts 'mongst divines, and difference of texts,
From whence arise diversity of sects,
And hateful heresies by God abhor'd. Spenser. [ 1913 Webster ]

Deluded people! that do not consider that the greatest heresy in the world is a wicked life. Tillotson. [ 1913 Webster ]

3. (Law) An offense against Christianity, consisting in a denial of some essential doctrine, which denial is publicly avowed, and obstinately maintained. [ 1913 Webster ]

A second offense is that of heresy, which consists not in a total denial of Christianity, but of some its essential doctrines, publicly and obstinately avowed. Blackstone. [ 1913 Webster ]

☞ “When I call dueling, and similar aberrations of honor, a moral heresy, I refer to the force of the Greek &unr_;, as signifying a principle or opinion taken up by the will for the will's sake, as a proof or pledge to itself of its own power of self-determination, independent of all other motives.” Coleridge. [ 1913 Webster ]