instrumental
adjective
                                                                                                                            
                                                            in·stru·men·tal
                    
                                                                                                              
                                                                                                                                  ˌin(t)-strə-ˈmen-tᵊl  
                                                      
                                                          
            1
                    
        a
    
          
                                          
              
          
                                                      : serving as a crucial means, agent, or tool                                      
              
                             
was instrumental in organizing the strike
                         
                
                    
        b
    
          
                                          
              
          
                                                      : of, relating to, or done with an instrument or tool                                      
                
                    
2
                    
                                          
              
          
                                                      : relating to, composed for, or performed on a musical instrument                                      
                
                    
3
                    
                                          
              
          
                                                      : of, relating to, or being a grammatical case or form expressing means or agency                                      
                
                    
4
                    
                                          
              
          
                                                      : of or relating to instrumentalism                                      
                
                    
5
                    
                                          
              
          
                                                      : operant sense 3                                      
              
                             
instrumental learning
                                       instrumental conditioning
                         
                
                    
                                                      instrumental
                                      noun
                                                                            
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  Merriam-Webster unabridged




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