retentivity
noun
                                                                                                                            
                                                            re·ten·tiv·i·ty
                    
                                                                                                              
                                                                                                                                  ˌrē-ˌten-ˈti-və-tē  
                                                                                                                              
            ri-
                                                      
                                                          
                                
              
          
                                                      : the power of retaining                                      
                
                                
            specifically                
          
                                                      : the capacity for retaining magnetism after the action of the magnetizing force has ceased                                      
            
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  Merriam-Webster unabridged




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