inflection
noun
                                                                                                                            
                                                            in·flec·tion
                    
                                                                                                              
                                                                                                                                  in-ˈflek-shən 
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : change in pitch or loudness of the voice                                      
                
                    
2
                    
        a
    
          
                                          
              
          
                                                      : the change of form that words undergo to mark such distinctions as those of case, gender, number, tense, person, mood, or voice                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a form, suffix, or element involved in such variation                                      
                
                    
        c
    
          3
                    
                                          
              
          
                                                      : the act or result of curving or bending : bend                                      
                
                    
4
                    
        a
    
          
                                          
              
          
                                                      : change in curvature of an arc or curve from concave to convex or conversely                                      
                
                    
        b
    
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  Merriam-Webster unabridged




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