1
                    
                                          
              
          
                                                      : of or relating to the mails or the post office                                      
                
                    
2
                    
                                          
              
          
                                                      : conducted by mail                                      
              
                             
postal chess
                         
                
                    3
                    
                                          
              
          
                                                      : insanely or murderously violent                                      
                
                  —usually used in the phrase go postal
    
                
                    
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  Merriam-Webster unabridged




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