- 1[intransitive] cooperate (with somebody) (in/on something) to work together with someone else in order to achieve something The two groups agreed to cooperate with each other. They had cooperated closely in the planning of the project.
- 2[intransitive] cooperate (with somebody) (in/on something) to be helpful by doing what someone asks you to do Their captors told them they would be killed unless they cooperated.
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NAmE//koʊˈɑpəˌreɪt//Verb Forms present simple I / you / we / they cooperate
he / she / it cooperates
past simple cooperated
-ing form cooperating