reformation -- (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 or political or religious affairs)
Reformation, Protestant Reformation -- (a religious movement of the 16th century that began as an attempt to reform the Roman Catholic Church and resulted in the creation of Protestant churches)
reclamation, reformation -- (rescuing from error and returning to a rightful course; "the reclamation of delinquent children")