MI5 Definition in the Cambridge English Dictionary
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Definition of “MI5” - English Dictionary

Definition of "MI5" - British English Dictionary

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MI5noun [+ sing/pl verb]

uk   us   /ˌem.aɪˈfaɪv/
the ​official British ​organization that is ​responsible for ​protectingmilitary and ​politicalsecrets
(Definition of MI5 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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