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MI5

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WordReference Random House Unabridged Dictionary of American English © 2026

MI5 n. (in Great Britain)

the government's security and counterespionage service that works in liaison with Scotland Yard's Special Branch.

M(ilitary) I(ntelligence, Section) 5

Collins Concise English Dictionary © HarperCollins Publishers::

MI5

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

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