(1) Rescuing from error and returning to a rightful course
"The reclamation of delinquent children"
(2) 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
(3) 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