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English definition of “cooperation”

cooperation

noun [U] (UK also co-operation)     /kəʊˌɒp.ərˈeɪ.ʃən/ US  /koʊˌɑː.pəˈreɪ-/
B2 the act of working together with someone or doing what they ask you: This movie was made with the cooperation of the victims' families. There's very little cooperation between the two countries. The company produces computers in cooperation with a German firm.Helping and co-operating
(Definition of cooperation noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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