Cooperation (sometimes written as co-operation or coöperation) is the process of groups of organisms working or acting together for common or mutual benefit, as opposed to working in competition for selfish benefit. 

One or more people cooperating for the sake of working together as a team for the echievement of a common goal.

Many animal and plant species cooperate both with other members of their own species and with members of other species (symbiosis or mutualism).
noun
1.
an act or instance of working or acting together for a common purpose or benefit; joint action.
2.
more or less active assistance from a person, organization, etc.:
We sought the cooperation of various civic leaders.
3.
willingness to cooperate : to indicate cooperation.
4.
Economics. the combination of persons for purposes of production, purchase, or distribution for their joint benefit: producers’ cooperation; consumers’ cooperation.
5.
Sociology. activity shared for mutual benefit.
6.
Ecology. mutually beneficial interaction among organisms living in a limited area.b
Some research even suggests that certain species provide more help to the individuals with which they are more closely related. This phenomenon is known as kin discrimination.

Read more about the meaning of the word “cooperate