Etymology
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heterodoxy (n.)

1650s, from Greek heterodoxia "error of opinion," from heterodoxos (see heterodox).

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Definitions of heterodoxy

heterodoxy (n.)
any opinions or doctrines at variance with the official or orthodox position;
Synonyms: unorthodoxy / heresy
heterodoxy (n.)
the quality of being unorthodox;
Synonyms: unorthodoxy
From wordnet.princeton.edu