Webster's English Dictionary

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reformation

ref.or.ma.tion \.ref-*r-'ma--sh*n\ \-shn*l, -sh*n-*l\ n 1: the act of 
   reforming : the state of being reformed  cap  2: a 16th century religious 
   movement marked ultimately by rejection or modi fication of much of Roman 
   Catholic doctrine and practice and establishment of the Protestant churches 
   - ref.or.ma.tion.al aj