author's alteration: Meaning and Definition of

au'thor's altera'tion

Pronunciation: [key]
  1. a correction or change made in typeset copy that is not a correction of an error introduced by the compositor. Abbr.: AA, A.A., a.a., aa Cf. printer's error.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.