Source : Webster's Revised Unabridged Dictionary (1913)

Orthodoxy \Or"tho*dox`y\, n. [Gr. ?: cf. F. orthodoxie. See
   {Orthodox}.]
   1. Soundness of faith; a belief in the doctrines taught in
      the Scriptures, or in some established standard of faith;
      -- opposed to {heterodoxy} or to {heresy}.

            Basil himself bears full and clear testimony to
            Gregory's orthodoxy.                  --Waterland.

   2. Consonance to genuine Scriptural doctrines; -- said of
      moral doctrines and beliefs; as, the orthodoxy of a creed.

   3. By extension, said of any correct doctrine or belief.

Source : WordNet®

orthodoxy
     n 1: the quality of being orthodox (especially in religion) [ant:
           {unorthodoxy}]
     2: a belief or orientation agreeing with conventional standards
        [ant: {unorthodoxy}]