Cooperate (verb)

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

Origin:

From latin cooperari, from co- ("together") + operari ("to wor.k")

Examples:

1. The two companies decided to cooperate on the project.
2. The departments in the company are cooperating to improve efficiency.
3. The government asked citizens to cooperate with the investigation.
4. He agreed to cooperate with the police.
5. The two countries decided to cooperate on trade.