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From The Collaborative International Dictionary of English v.0.48:
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.] [1913 Webster] 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. [1913 Webster] When spelling no longer follows the pronunciation, but is hardened into orthography. --Earle. [1913 Webster] 2. The part of grammar which treats of the letters, and of the art of spelling words correctly. [1913 Webster] 3. A drawing in correct projection, especially an elevation or a vertical section. [1913 Webster] 4. The method of spelling the words of a particular language; the system of symbols used for writing a language. [PJC] 5. The branch of linguistics concerned with how languages are written. [PJC]