Alteration to a better form.

革新；改善。

A radical change for the better in social, political, or religious affairs.

(社会、政治或宗教上之)激烈改革。

The religious movement begun by Martin Luther in the 16th century, having for its aim the reform of the Roman Catholic church and resulting in the formation of the Protestant Churches.

宗教改革运动(欧洲十六世纪马丁路德发起之宗教大改革)。