ex necessitate rei
Latin phrase
                                                                                                                            
                                                            ex ne·ces·si·ta·te rei
                    
                                                                                                              
                                                                                                                                  ˌeks-ne-ˌke-si-ˈtä-te-ˈrā(-ˌē) 
                                                      
                                                          
            
                                
              
          
                                                      : from the necessity of the thing : as an exception in a given legal case                                      
                
                    
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  Merriam-Webster unabridged




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