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

master key

noun

/ˈmɑːstə kiː/

/ˈmæstər kiː/

(also pass key)

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a key that can be used to open many different locks in a building

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See master key in the Oxford Advanced American Dictionary

Check pronunciation: master key

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master key

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adverb

From the Word list

B1

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