MI5

MI5

[em-ahy-fahyv]
noun (in Great Britain)
the government's security and counterespionage service that works in liaison with Scotland Yard's Special Branch.

Origin:
M(ilitary) I(ntelligence, Section) 5

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World English Dictionary
MI5
 
abbreviation for
Military Intelligence, section five; a former official and present-day popular name for the counterintelligence agency of the British Government

Collins English Dictionary - Complete & Unabridged 10th Edition
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