Webster's English Dictionary

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integration

in.te.gra.tion \.int-*-'gra--sh*n\ n 1: the act or process or an instance 
   of integrating : as  1a: incorporation as equals into society or an 
   organization of individuals  of different groups (as races) 1b: 
   coordination of mental processes into a normal effective personality or  
   with the individual's environment 2a: the operation of finding a function 
   whose differential is known  2b: the operation of solving a differential 
   equation