Webster's English Dictionary

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transformation

trans.for.ma.tion \.tran(t)s-f*r-'ma--sh*n, -.fo.r-\ n 1: an act, process, 
   or instance of transforming or being transformed  2: false hair esp. worn 
   by a woman  3a: the operation of changing (as by rotation or mapping) one 
   configuration  or expression into another in accordance with a mathematical 
   rule 3b: the formula that effects such a change