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
1909, H. G. Wells, The History of Mr. Polly Chapter 9
To return to a good state; to amend or correct one's own character or habits
It is hoped that many criminals, upon being freed, will eventually reform.
To form again or in a new configuration.
The regiment reformed after surviving the first attack.
Corrected; amended; restored to purity or excellence; said, specifically, of the whole body of Protestant churches originating in the Reformation, or, in a more restricted sense, of those who separated from Martin Luther on the doctrine of consubstantiation, etc., and carried the Reformation, as they claimed, to a higher point.
Amended in character and life.
a reformed gambler or drunkard
(of an officer) Retained in service on half or full pay after the disbandment of the company or troop.