archaism
noun
                                                                                                                            
                                                            ar·cha·ism
                    
                                                                                                              
                                                                                                                                  ˈär-kē-ˌi-zəm  
                                                                                                                              
            -(ˌ)kā-ˌi-
                                                      
                                                          1
                    
                                          
              
          
                                                      : the use of archaic diction or style                                      
                
                    
2
                    
                                          
              
          
                                                      : an instance of archaic usage                                      
                
                    
3
                    
                                          
              
          
                                                      : something archaic                                      
                
                                
            especially                
          
                                                      : something (such as a practice or custom) that is outmoded or old-fashioned                                      
            
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  Merriam-Webster unabridged




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