1
                    
        a
    
          
                                          
              
          
                                                      : the transmission of evaluative or corrective information about an action, event, or process to the original or controlling source                                      
                
                                
            also                
          
                                                      : the information so transmitted                                      
            
            
        b
    
          
                                          
              
          
                                                      : the partial reversion (see reversion sense 3a) of the effects of a process to its source or to a preceding stage                                      
                
                    
2
                    
                                          
              
          
                                                      : the return to the input of a part of the output of a machine, system, or process (as for producing changes in an electronic circuit that improve performance or in an automatic control device that provide self-corrective action)                                      
                
                    
3
                    
                                          
              
          
                                                      : a rumbling, whining, or whistling sound resulting from an amplified or broadcast signal (such as music or speech) that has been returned as input and retransmitted                                      
                
                    
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  Merriam-Webster unabridged




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