gratuity
noun
                                                                                                                            
                                                            gra·tu·i·ty
                    
                                                                                                              
                                                                                                                                  grə-ˈtü-ə-tē  
                                                                                                                              
            -ˈtyü-
                                                      
                                                          
            
               plural gratuities            
        
    
                                
              
          
                                                      : something given voluntarily or beyond obligation usually for some service                                      
                
                                
            
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  Merriam-Webster unabridged




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