1
                    as in proficiency
                                                
              
          
                                                      a highly developed skill in or knowledge of something                                       
              
                             the exchange student returned from her year in Spain with a complete mastery of the language                         
                
                                                                                                                                                                          
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2
                    as in power
                                                
              
          
                                                      the right or means to command or control others                                       
              
                             the British monarch has only token mastery over the citizens of the United Kingdom                         
                
                                                                                                                                                                                                                    
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  Merriam-Webster unabridged




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