noun. The act or practice of cooperating.

noun. The association of persons or businesses for common, usually economic, benefit.

noun. The act of cooperating or being cooperative.

noun. Active help from a person, organization, et cetera.

noun. An orderly sharing of space or resources.

noun. Association for mutual benefit, such as for purposes of production or purchase.

"When Tit-for-Tat is inoperative, anarchism can achieve mutual cooperation only if all agents always choose to act cooperatively even when its physically possible to defect and exploit others 'cooperation*."

cooperative  

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