The Collaborative International Dictionary of English v.0.48:

Emendation \Em`en*da"tion\, n. [L. emendatio: cf. F.
   ['e]mendation.]
   1. The act of altering for the better, or correcting what is
      erroneous or faulty; correction; improvement. "He lies in
      his sin without repentance or emendation." --Jer. Taylor.
      [1913 Webster]

   2. 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.
      [1913 Webster]

WordNet (r) 3.0 (2006):

emendation
    n 1: a correction by emending; a correction resulting from
         critical editing