unsaturation
noun
                                                                                                                            
                                                            un·sat·u·ra·tion
                    
                                                                                                              
                                                                                                                                  -ˌsach-ə-ˈrā-shən 
                                                      
                                                          
            
                                
              
          
                                                      : the quality or state of being unsaturated                                      
                
                    
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  Merriam-Webster unabridged




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