Orthodox

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Orthodox might refer to:

• The quality of being conforming, established, or traditional; especially a term regarding religion, but also used more generally.
• Eastern Orthodox Church
• Orthodox Judaism
• Orthodoxy, a 1908 book by G. K. Chesterton.

In religion, the opposite of orthodox is heterodox, a.k.a. heretical. More generally, the term unorthodox is used for the unconventional.