Etymology
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orthodoxy (n.)

"correctness of opinion," especially in theology; "conformity to the Church creeds," 1620s, from French orthodoxie and directly from Late Latin orthodoxia, from late Greek orthodoxia "right opinion," abstract noun from orthodoxos "having the right opinion" (see orthodox). Orthodoxies "correct belief or opinion" is by 1871.

updated on October 02, 2019

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Definitions of orthodoxy from WordNet

orthodoxy (n.)
the quality of being orthodox (especially in religion);
orthodoxy (n.)
a belief or orientation agreeing with conventional standards;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.