reformation

noun2

1. •
   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.

   • […] olde men long nusled in corruption, scorning them that would seeke reformation […] — 1587
2. •
   Change or correction, by a court in equity, to a written instrument to conform to the original intention of the parties.