n.
1.improvement (or an intended improvement) in the existing form or condition of institutions or practices etc.
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.rescuing from error and returning to a rightful course
Idiom of the Day
leak out (something) or leak (something) out
to disclose special or secret information to the press
Somebody leaked out the information about the illegal donations to the press.