1. of, relating to, or conforming to the approved form of any doctrine, philosophy, ideology, etc.
  2. of, relating to, or conforming to beliefs, attitudes, or modes of conduct that are generally approved.
  3. customary or conventional, as a means or method; established.
  4. sound or correct in opinion or doctrine, especially theological or religious doctrine.
  5. conforming to the Christian faith as represented in the creeds of the early church.
  6. (initial capital letter) of, relating to, or designating the Eastern Church, especially the Greek Orthodox Church.
  7. (initial capital letter) of, relating to, or characteristic of Orthodox Jews or Orthodox Judaism.

Origin of orthodox

1575–85; < Late Latin orthodoxus right in religion < Late Greek orthódoxos, equivalent to ortho- ortho- + dóx(a) belief, opinion + -os adj. suffix
Related formsor·tho·dox·ly, adverbor·tho·dox·ness, nounan·ti·or·tho·dox, adjectivean·ti·or·tho·dox·ly, adverbhy·per·or·tho·dox, adjectivenon·or·tho·dox, adjectivenon·or·tho·dox·ly, adverbpro-or·tho·dox, adjectivesem·i·or·tho·dox, adjectivesem·i·or·tho·dox·ly, adverbul·tra·or·tho·dox, adjectiveun·or·tho·dox, adjective

Synonyms for orthodox

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Contemporary Examples of ultra-orthodox

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British Dictionary definitions for ultra-orthodox


  1. conforming with established or accepted standards, as in religion, behaviour, or attitudes
  2. conforming to the Christian faith as established by the early Church
Derived Formsorthodoxly, adverb

Word Origin for orthodox

C16: via Church Latin from Greek orthodoxos, from orthos correct + doxa belief


  1. of or relating to the Orthodox Church of the East
  2. (sometimes not capital)
    1. of or relating to Orthodox Judaism
    2. (of an individual Jew) strict in the observance of Talmudic law and in personal devotions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ultra-orthodox



mid-15c., of opinions, faith, from Late Latin orthodoxus, from Greek orthodoxos "having the right opinion," from orthos "right, true, straight" (see ortho-) + doxa "opinion, praise," from dokein "to seem," from PIE root *dek- "to take, accept" (see decent). As the name of the Eastern Church, first recorded in English 1772; in reference to a branch of Judaism, first recorded 1853.

Online Etymology Dictionary, © 2010 Douglas Harper