1
                    
                                          
              
          
                                                      : one that tunes                                      
              
                             
a piano tuner
                         
                
                    2
                    
                                          
              
          
                                                      : something used for tuning                                      
                
                                
            specifically                
          
                                                      : the part of a receiving set that converts radio signals into audio or video signals                                      
            
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  Merriam-Webster unabridged




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