Cooperative (adjective)

1. Willing to work together with others towards a common goal or purpose.
2. Acting in harmony or agreement with others.
3. Willing to willingly assist or comply with the requests or demands of others.

Origin:

From latin cooperativus, from cooperari ("to work togethe.r")

Examples:

1. He was a cooperative employee.
2. The meeting was cooperative and productive.
3. The witnesses were cooperative during the investigation.
4. The group was cooperative in solving the problem.
5. The company had a cooperative attitude towards its employees.