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

adj adhering to what is commonly accepted

“an orthodox view of the world”
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
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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