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 of MI5

M(ilitary) I(ntelligence, Section) 5

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mi5

Contemporary Examples of 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
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
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
MI5 focuses on domestic threats; MI6 is the British equivalent of the CIA.
The FBI’s Scotland Yard Jitters
Philip Shenon
July 14, 2011
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

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

Word Origin and History for mi5

MI5

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