MI5



[em-ahy-fahyv] /ˈɛmˌaɪˈfaɪv/

noun, (in Great Britain)
1.
the government’s security and counterespionage service that works in liaison with Scotland Yard’s Special Branch.
abbreviation
1.
Military Intelligence, section five; a former official and present-day popular name for the counterintelligence agency of the British Government

1939, from abbreviation of Military Intelligence, followed by the department number.

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