lightened; lightening
                                        ˈlīt-niŋ  
                                    
    ˈlī-tᵊn-iŋ
    
            
        1
                    
                                          
              
          
                                                      : to make light or clear : illuminate                                      
                
                    
2
                    
                                archaic 
                                  
              
          
                                                      : enlighten                                      
                
                    
3
                    
                                          
              
          
                                                      : to make (something, such as a color) lighter                                      
                
                    
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  Merriam-Webster unabridged




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