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[em-ahy-fahyv] /ˈɛmˌaɪˈfaɪv/
noun, (in Great Britain)
the government's security and counterespionage service that works in liaison with Scotland Yard's Special Branch.
Origin of MI5
M(ilitary) I(ntelligence, Section) 5 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for MI5


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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for MI5

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

Online Etymology Dictionary, © 2010 Douglas Harper
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