involution
noun
                                                                                                                            
                                                            in·vo·lu·tion
                    
                                                                                                              
                                                                                                                                  ˌin-və-ˈlü-shən  
                                                      
                                                          
            1
                    
        a(1)
    
                
                                          
              
          
                                                      : the act or an instance of enfolding or entangling : involvement                                      
                
                    
        (2)
    
          
                                          
              
          
                                                      : an involved grammatical construction usually characterized by the insertion of clauses between the subject and predicate                                      
                
                    
        b
    
          2
                    
                  3
                    
        a
    
          
                                          
              
          
                                                      : an inward curvature or penetration                                      
                
                    
        b
    
          
                                          
              
          
                                                      : the formation of a gastrula by ingrowth of cells formed at the dorsal lip                                      
                
                    
4
                    
                                          
              
          
                                                      : a shrinking or return to a former size                                      
                
                    
5
                    
                                          
              
          
                                                      : the regressive alterations of a body or its parts characteristic of the aging process                                      
              
                             
skeletal involution due to loss of estrogens at menopause
                         
                
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  Merriam-Webster unabridged




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