orthography

Concise Oxford English Dictionary © 2008 Oxford University Press:
orthography /ɔːˈθɒgrəfi/

▶noun (pl. orthographies)

• 1 the conventional spelling system of a language.

  ■ the study of spelling and how letters combine to represent sounds and form words.

• 2 orthographic projection.

– derivatives
orthographer noun,
orthographic adjective,
orthographical adjective,
orthographically adverb.

– origin ME: via OFr. and L. from Gk orthographia, from orthos ‘correct’ + -graphia ‘writing’.