Webster's English Dictionary

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cooperation

co.op.er.a.tion \(.)ko--.a:p-*-'ra--sh*n\ \-sh(*-)n*st\ n 1: the act or 
   process of cooperating  2: association of persons for common benefit  3: a 
   dynamic ecological state of organisms living in aggregation characteri zed 
   by sufficient mutual benefit to outweigh disadvantages associated with 
   crowding - co.op.er.a.tion.ist n