cooperation
co·op·er·a·tion
 /koʊˌɑːpəˈreıʃən/  noun   [  noncount  ]
  1 : a situation in which people work together to do something
   The report cited a lack of cooperation between state and local officials.
   The fair was organized in cooperation with local businesses. = The fair was organized with the cooperation of local businesses.
  2 : the actions of someone who is being helpful by doing what is wanted or asked for
   Thank you for your cooperation.
   We are asking for your full cooperation.