Definition of cooperation noun from the Oxford Advanced American Dictionary

        

    cooperation

     noun
    noun
    NAmE//koʊˌɑpəˈreɪʃn//
     
    [uncountable]
     
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  1. 1the fact of doing something together or of working together toward a shared aim cooperation (with somebody) (in doing something) a report produced by the government in cooperation with the chemical industry cooperation (between A and B) We would like to see closer cooperation between parents and schools.
  2. 2 cooperation (in doing something) willingness to be helpful and do as you are asked We would be grateful for your cooperation in vacating the theater as quickly as possible.
See the Oxford Advanced Learner's Dictionary entry: cooperation