What is the meaning of Reformed?

simple past and past participle of reform

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.

Retained in service on half or full pay after the disbandment of the company or troop.

Source: wiktionary.org