Plural form; multiple beliefs, opinions, or doctrines that depart from what is officially accepted or traditional.
Plural of heterodoxy, from Greek hetero- 'different' and doxa 'opinion,' with the Greek suffix -ia. The concept emerged prominently during the Reformation when various Christian groups challenged Church authority.
During the Middle Ages, the Catholic Church literally burned people for holding heterodoxies—which shows how powerful the pressure to conform can be, and how dangerous challenging the official story was considered.
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