Definition -
(1) Correct spelling.
(2) The part of grammar which deals with spelling.

Etymology -
The term derives from the Greek orthos, correct + graphein, to write.

Oxford English Dictionary -
The term's first citation in sense (2) above is from 1588:
"Orthographie … teacheth with what letters euery syllable and word must be written, and with what points the sentence and parts thereof must be distinguished. … Which expressing and skill of the hand, belongeth properly to the Arte of Painting, and not vnto Grammar."
(W. Kempe Educ. Children sig. F 3v )

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