reformation (n.)

late 14c., reformacioun, "restoration, re-establishment;" early 15c., "improvement, alteration for the better," from Old French reformacion and directly from Latin reformationem (nominative reformatio), noun of action from past-participle stem of reformare "to form again, change, transform, alter," from re- "again" (see re-) + formare "to form" (see form (n.)).

With capital R-, in reference to the great 16c. European religious revolution, it is attested by 1540s, borrowed from Luther. The movement began as a bid to "reform" doctrines and practices of the Church of Rome.

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Definitions of reformation
reformation (n.)
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 (n.)
rescuing from error and returning to a rightful course;
Synonyms: reclamation
Reformation (n.)
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;
Synonyms: Protestant Reformation