An improvement.
The act of making better.
The process by which a term gains a more positive connotation over time.
An ameliorative change of a concept or a repertoire of concepts.
An improvement (or an intended improvement) in the existing form or condition of institutions or practices, etc.; intended to make a striking change for the better in social, political or religious affairs or in the conduct of persons or operation of organizations.
Change or correction, by a court in equity, to a written instrument to conform to the original intention of the parties.