collaborate
verb
                                                                                                                            
                                                            col·lab·o·rate
                    
                                                                                                              
                                                                                                                                  kə-ˈla-bə-ˌrāt  
                                                      
                                                          
            
            
              collaborated; collaborating            
        
    1
                    
                                          
              
          
                                                      : to work jointly with others or together especially in an intellectual endeavor                                      
              
                             
An international team of scientists collaborated on the study.
                         
                
                    2
                    
                                          
              
          
                                                      : to cooperate with or willingly assist an enemy of one's country and especially an occupying force                                      
              
                             
suspected of collaborating with the enemy
                         
                
                    3
                    
                                          
              
          
                                                      : to cooperate with an agency or instrumentality with which one is not immediately connected                                      
              
                             
The two schools collaborate on library services.
                         
                
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  Merriam-Webster unabridged




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