The change of something that is defective, broken, inefficient or otherwise negative, in order to correct or improve it

(transitive) To put into a new and improved form or condition; to restore to a former good state, or bring from bad to good; to change from worse to better

The quality of being reformable; potential for reform.

That can be reformed.

a political movement/party

Of Reform Judaism, its tenets, or its adherents.

In a reformative manner.

plural of reformation

Of or pertaining to reformation

Of the Protestant movement typically associated with John Calvin, as separated from the Lutheran Church to pursue more extensive reformation.