effacement
noun
                                                                                                                            
                                                            ef·face·ment
                    
                                                                                                              
                                                                                                                                  i-ˈfās-mənt  
                                                                                                                              
            e-
                                                      
                                                          1
                    
                                          
              
          
                                                      : the act or process of effacing or eliminating something                                      
              
                             
Effacement of the forces that press upon or against consciousness is not a simple negation.— Charles E. Winquist
Charles E. Winquist
                         
                
                                
            especially                
          
                                                      : reduction to insignificance                                       
              
                             
            It wasn't until after Luce's death, in 1967, that Hadden's name was restored to its place at the top of Time's masthead. His precocious rise and then gradual effacement is the fascinating story of Isaiah Wilner's "The Man Time Forgot … "    — Charles McGrath
Charles McGrath          
                         
            2
                    
                                medical 
                                  
              
          
                                                      : the thinning or obliteration of tissue or narrowing of an internal anatomical space                                      
              
                             
effacement of the spinal subarachnoid space
                         
                
                                
            especially                
          
                                                      : the shortening and thinning of the uterine cervix during labor so that only the external orifice remains                                      
            
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  Merriam-Webster unabridged




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