- 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.
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- 2cooperation (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.
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