The act of altering for the better, or correcting what is erroneous or faulty; correction; improvement.

Alteration by editorial criticism, as of a text so as to give a better reading; removal of errors or corruptions from a document; as, the book might be improved by judicious emendations.

a correction by emending; a correction resulting from critical editing

Changing a definition of a name by proposal to, and approval by, the Committee on Phylogenetic Nomenclature.

An intentional change to a previously proposed name, e.g., Lindinger proposed the emendation Hemiberlesea for the armored scale Hemiberlesia indicating that it was originally improperly formed.