tautological
adjective
                                                                                                                            
                                                            tau·to·log·i·cal
                    
                                                                                                              
                                                                                                                                  ˌtȯ-tə-ˈlä-ji-kəl 
                                                      
                                                          
            2
                    
                                          
              
          
                                                      : true by virtue of its logical form alone                                      
                
                    
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  Merriam-Webster unabridged




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