Definition of masterly adjective from the Oxford Advanced Learner's Dictionary

 

masterly

 adjective
adjective
BrE BrE//ˈmɑːstəli//
 
; NAmE NAmE//ˈmæstərli//
 
(also masterful)
 
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showing great skill or understanding a masterly performance Her handling of the situation was masterly. In the face of this threat to his authority, he opted for masterly inactivity.
See the Oxford Advanced American Dictionary entry: masterly