all-timer
noun
                                                                                                                            
                                                            all-tim·er
                    
                                                                                                              
                                                                                                                                  ˈȯl-ˌtī-mər 
                                                      
                                                          
            
        US      
      
                                
                                
              
          
                                                      : an exceptional person or thing that is regarded as the best or as among the best of all time                                      
              
                             
… the fifth game of the National League Championship series, in San Diego, which was an all-timer by any measure …—
Roger Angell
                         
                
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  Merriam-Webster unabridged




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