sororate
noun
                                                                                                                            
                                                            so·ro·rate
                    
                                                                                                              
                                                                                                                                  sə-ˈrȯr-ət 
                                                      
                                                          
            
                                
              
          
                                                      : the marriage of one man to two or more sisters usually successively and after the first wife has been found to be barren or after her death                                      
                
                    
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  Merriam-Webster unabridged




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