Definition of reformation noun from the Oxford Advanced American Dictionary

     

    reformation

     noun
    noun
    NAmE//ˌrɛfərˈmeɪʃn//
     
     
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  1. 1[uncountable] (formal) the act of improving or changing someone or something
  2. 2 the Reformation [singular] new ideas in religion in 16th century Europe that led to attempts to reform the Roman Catholic Church and to the forming of the Protestant Churches; the period of time when these changes were taking place
See the Oxford Advanced Learner's Dictionary entry: reformation