Source : Webster's Revised Unabridged Dictionary (1913)

Orthography \Or*thog"ra*phy\, n. [OE. ortographie, OF.
   orthographie, L. orthographia, Gr. ?, fr. ? writing
   correctly; 'orqo`s right + gra`fein to write. See {Ortho-},
   and {Graphic}.]
   1. The art or practice of writing words with the proper
      letters, according to standard usage; conventionally
      correct spelling; also, mode of spelling; as, his
      orthography is vicious.

            When spelling no longer follows the pronunciation,
            but is hardened into orthography.     --Earle.

   2. The part of grammar which treats of the letters, and of
      the art of spelling words correctly.

   3. A drawing in correct projection, especially an elevation
      or a vertical section.

Source : WordNet®

orthography
     n : a method of representing the sounds of a language by written
         or printed symbols [syn: {writing system}]