n.

1. 合作，协力[U]
   The success of the project relies on the cooperation of all involved parties.

   这个项目的成功依赖于所有相关部门的合作。

   The prime minister's visit further promoted the cooperation between the two countries.

   总理的访问进一步促进了两国间的合作。

2. 合作社[C]
3. 【生】协同作用，互助[U]

n.

1. the action or process of cooperating.
2. Economics  the formation and operation of cooperatives.