: a first or chief person: such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : a member of a jury who acts as chairman and spokesman                                      
                
                    
        b(1)
    
                
                                          
              
          
                                                      : a chief and often specially trained worker who works with and usually leads a gang or crew                                      
                
                    
        (2)
    
          
                                          
              
          
                                                      : a person in charge of a group of workers, a particular operation, or a section of a plant                                      
                
                    
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  Merriam-Webster unabridged




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