Noah Webster's New International Dictionary of the English Language

1. (a.) Corrected; amended; restored to purity or excellence; said, specifically, of the whole body of Protestant churches originating in the Reformation. Also, in a more restricted sense, of those who separated from Luther on the doctrine of consubstantiation, etc., and carried the Reformation, as they claimed, to a higher point. The Protestant churches founded by them in Switzerland, France, Holland, and part of Germany, were called the Reformed churches.

2. (a.) Amended in character and life; as, a reformed gambler or drunkard.

3. (a.) Retained in service on half or full pay after the disbandment of the company or troop; -- said of an officer.