Meaning of “cooperation” - Learner’s Dictionary

cooperation

noun [ U ] ( also UK co-operation) uk us /kəʊˌɒpəˈreɪʃən/

B2 a situation in which you work together with someone or do what they ask you:

international cooperation
The school works in close cooperation with parents.

(Definition of “cooperation” from the Cambridge Learner’s Dictionary © Cambridge University Press)