diminution
noun
                                                                                                                            
                                                            dim·i·nu·tion
                    
                                                                                                              
                                                                                                                                  ˌdi-mə-ˈnü-shən 
                                                                                                                              
             also  -ˈnyü-
                                                      
                                                          
                                
              
          
                                                      : the act, process, or an instance of becoming gradually less (as in size or importance) : the act, process, or an instance of diminishing : decrease                                      
              
                             
a diminution in value
                         
                
                    Love words? Need even more definitions?
  
  Merriam-Webster unabridged




Share