Emend \ih-MEND\ , verb;
1. To free from faults or errors; correct
2. To edit or change a text
According to Etymonline.com:
Dating from the 1400's, emend comes from Latin emendare ("to free from fault") which is a combination of ex- ("out") + mendum "fault, blemish"). This word entered the English language about 100 years after amend did, although the latter took a slightly more circuitous route. It also comes from Latin emendare, but took on the Old French spelling amender. Both words have the same basic meaning, but amend can be used in more contexts (e.g. legislation) while emend can only be used in the context of written language.
*Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Sunday, November 14