Orthodox practices or beliefs are generally accepted as true or correct. If you are an orthodox vegetarian, you never, ever eat meat — not like those people who have fish once in a while.

When capitalized, Orthodox is the name of the Eastern Church, originally distinguished by its doctrinal differences from the other divisions of the Christian Church. Orthodox is also the name of the branch of Judaism that strictly follows traditional beliefs and customs, derived from orthodox in the earlier meaning of "strictly observant."

Definitions of orthodox
  1. adjective
    adhering to what is commonly accepted
    “an orthodox view of the world”
    synonyms: mainstream
    resistant to change
    opposed to heresy
    canonic, canonical, sanctioned
    conforming to orthodox or recognized rules
    conforming, conformist
    adhering to established customs or doctrines (especially in religion)
    conventional, established
    conforming with accepted standards
    pertaining to time-honored orthodox doctrines
    unaffected by the Reformation
    established or well-known or widely recognized as a model of authority or excellence
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    breaking with convention or tradition
    dissentient, recusant
    (of Catholics) refusing to attend services of the Church of England
    dissident, heretical, heterodox
    characterized by departure from accepted beliefs or standards
    characterized by attack on established beliefs or institutions
    nonconforming, nonconformist
    not conforming to established customs or doctrines especially in religion
    of or relating to the body of Protestant Christianity arising during the Reformation; used of some Protestant churches especially Calvinist as distinct from Lutheran
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