Webster's English Dictionary

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differentiation

dif.fer.en.ti.a.tion \-.ren-che--'a--sh*n\ n 1: the act or process of 
   differentiating  2: development from the one to the many, the simple to the 
   complex, or the  homogeneous to the heterogeneous 3a: modification of body 
   parts for performance of particular functions  3b: the sum of the processes 
   whereby apparently indifferent cells, tissues,  and structures attain their 
   adult form and function