Cooperation (noun)

1. The process of working together to the same end.
2. Willingness to act together.
3. Helpful behavior.

Origin:

Late 18th century: from co- "together" + operation.

Examples:

1. The cooperation of the two countries in the field of technology.
2. The cooperation between the companies.
3. The government is seeking the cooperation of the opposition.
4. We need cooperation to achieve our goals.
5. The children were praised for their cooperation.