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cooperation

/koʊˌɑ.pəˈɹeɪ.ʃən/ noun B2
  1. The act of cooperating. (uncountable)
  2. Active help from a person, organization, etc., such as an orderly sharing of space or resources. (countable, uncountable)
  3. Association for mutual benefit, such as for purposes of production or purchase. (countable, uncountable)

Plural cooperations

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From the library

Now, my dear fellow, in the matter of these explanations, we have, if I may ask for your cooperation, a hard and dangerous night’s work in front of us.
The Return of Sherlock Holmes, p. 9 · C1
If, as I imagine, there is no breach of the law in this matter, you can absolutely depend upon my discretion and my cooperation in keeping the facts out of the papers.”
The Return of Sherlock Holmes, p. 124 · C1
With cooperation and determination, we can overcome some of our greatest environmental challenges.
The City That Almost Ran Dry, p. 1 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.