From Late Middle English orthodoxe, from Middle French orthodoxe and its etymon Late Latin orthodoxus, from Ancient Greek ὀρθόδοξος, from ὀρθός + δόξα.

• (British) IPA: /ˈɔːθədɒks/
• (America) IPA: /ˈɔɹθədɑks/

orthodox

1. Conforming to the accepted, established, or traditional doctrines of a given faith, religion, or ideology. [from 15th c.]

   Synonyms: homodox

   Antonyms: heretical, heterodox, inorthodox, nonorthodox, unorthodox

   • 2005, Alister E McGrath, Iustitia Dei:

     Five important modifications were made by the Pietists to the orthodox doctrine of justification, each corresponding to a distinctive aspect of the movement's agenda.

2. Adhering to whatever is customary, traditional, or generally accepted. [1640s]

   Synonyms: conservative, conventional

   Antonyms: liberal, outlandish, unorthodox

   • 1838, [Edward Bulwer-Lytton], chapter VII, in Alice or The Mysteries […], volume I, London: Saunders and Otley, […], →OCLC ↗, book III, [https://babel.hathitrust.org/cgi/pt?id=nyp.33433074938808;view=1up;seq=8 pages 297–298]:

     She tattled on: first to one, then to the other—then to all, till she had tattled herself out of breath;—and then the orthodox half hour had expired, and the bell was rung, and the carriage ordered, and Mrs. Hare rose to depart.

3. Of the eastern churches, Eastern Orthodox. [1772]

   Antonyms: Roman Catholic, Western Christianity

4. Of a branch of Judaism. [1853]

   Antonyms: liberal, Reform Judaism

5. (botany) Of pollen, seed, or spores: viable for a long time; viable when dried to low moisture content. [c. 1975]

   Antonyms: recalcitrant

• French: orthodoxe
• German: orthodox
• Italian: ortodosso
• Portuguese: ortodoxo
• Russian: ортодокса́льный
• Spanish: ortodoxo

• French: orthodoxe
• German: orthodox
• Italian: ortodosso
• Portuguese: ortodoxo
• Russian: общепри́нятый
• Spanish: ortodoxo

orthodox

1. (Christianity) Of or pertaining to the Orthodox Churches collectively.
2. (Christianity, loosely) Of or pertaining to a particular Orthodox Church, usually the Eastern Orthodox Church, sometimes the Oriental Orthodox Church or the Church of the East.
3. (Judaism) Of or pertaining to Orthodox Judaism.
4. (Quakerism) Of or pertaining to the Orthodox Quakers, a group of Quakers (subdivided into the Wilburite, Gurneyite and Beaconite branches) who split with the Hicksite Quakers due to favoring adopting mainstream Protestant orthodoxy.
   • 2006, Martha Paxson Grundy, The Evolution of a Quaker Community: Middletown Meeting, Bucks County, Pennsylvania, 1750-1850:

     [...which] Doherty hypothesized as the controlling variable for predicting who would become Orthodox or who would be Hicksite.

• French: orthodoxe
• German: orthodox
• Italian: ortodosso
• Portuguese: ortodoxo
• Russian: правосла́вный
• Spanish: ortodoxo

• Portuguese: ortodoxo
• Russian: ортодоксальный (иудаизм)

orthodox

1. (uncommon) An Orthodox Christian.
   • 1984, David Gillard (ed.), British documents on foreign affairs: Reports and papers from the Foreign Office confidential print, Part I: From the mid-nineteenth century to the First World War, Series B: The Near and Middle East, 1856-1914, page 31.

     The Greek Catholic priesthood, who proselytize among the Orthodoxes, are specially favoured, and donations are given for Masses in the churches of the Capuchin and the Franciscan Friars.

2. (rare) An Orthodox Jew.