inverse variation
noun
1
                    
                                          
              
          
                                                      : mathematical relationship between two variables which can be expressed by an equation in which the product of two variables is equal to a constant                                      
                
                    
2
                    
                                          
              
          
                                                      : an equation or function expressing inverse variation   compare direct variation                                      
                
                    
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  Merriam-Webster unabridged




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