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English definition of “orthodox”

orthodox

adjective uk   /ˈɔː.θə.dɒks/ us    /ˈɔːr.θə.dɑːks/
C2 (of beliefs, ideas, or activities) considered traditional, normal, and acceptable by most people: orthodox treatment/methods orthodox views/opinions We would prefer a more orthodox approach/solution to the problem.
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Standard and routine
C2 (of religious people) having more traditional beliefs than other people in the same religious group: orthodox Christians/Jews/MuslimsReligious beliefs and atheistic beliefs the (Greek/Russian/Eastern) Orthodox Church a part of the Christian Church, with many members in Greece, Russia, and eastern EuropeChristian denominationsThe Roman Catholic Church
(Definition of orthodox from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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