English

Definition of master key noun from the Oxford Advanced Learner's Dictionary

 

master key

 noun
noun
BrE BrE//ˈmɑːstə kiː//
 
; NAmE NAmE//ˈmæstər kiː//
 
(also pass key)
 
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a key that can be used to open many different locks in a building
See the Oxford Advanced American Dictionary entry: master key