Definition of reformer noun from the Oxford Advanced Learner's Dictionary

 

reformer

 noun
noun
BrE BrE//ˈfɔːmə(r)//
 
; NAmE NAmE//ˈfɔːrmər//
 
 
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a person who works to achieve political or social change Charlotte Mason (1842–1923), educational reformer, was born 1 January 1842 in Bangor. Many social reformers have been regarded as criminals and law-breakers in the past.
See the Oxford Advanced American Dictionary entry: reformer