MI5

[ 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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for mi5

Are you unaware of the role agent provocateurs, special branch and MI5 have played in undermining us?
Did MI5 Spies Troll J.K. Rowling Over Scottish Independence?|The Telegraph|June 28, 2014|DAILY BEAST
At Risk By Stella Rimington The first novel by the best spy storyteller today, the former head of MI5.
Our Favorite Books of 2012: Tina Brown, Andrew Sullivan, and Others’ Picks|The Daily Beast|December 11, 2012|DAILY BEAST
At the start of the war, on the orders of his Soviet handler, he successfully “coat trailed” his way into MI5.
War’s Most Powerful Weapon: Double Agents from WWII to Al Qaeda|Ben Macintyre|July 28, 2012|DAILY BEAST
MI5 focuses on domestic threats; MI6 is the British equivalent of the CIA.
The FBI’s Scotland Yard Jitters|Philip Shenon|July 14, 2011|DAILY BEAST

Defend the Realm: The Authorized History of MI5 by Christopher Andrew is one such tome.
Her Majesty's Secrets Revealed|Gerald Posner|November 15, 2009|DAILY BEAST

British Dictionary definitions for mi5

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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012