Webster's English Dictionary

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reversal

re.ver.sal \ri-'v*r-s*l\ n 1: an act or the process of reversing : as  1a: 
   a change or overthrowing of a legal proceeding or judgment  1b: a causing 
   to move or face in an opposite direction or to appear in an i nverted 
   position 2: a conversion of a photographic positive into a negative or vice 
   versa