Definitions for mi5
This page provides all possible meanings and translations of the word mi5
The domestic intelligence agency of the United Kingdom, which operates in secret and whose primary function is to spy on terrorist organizations and others viewed as a threat to British national security. Formally known as the Security Service.
Origin: Originally an abbreviation for Military Intelligence, division five.
The Security Service, commonly known as MI5, is the United Kingdom's domestic counter-intelligence and security agency and is part of its core intelligence machinery alongside the Secret Intelligence Service focused on foreign threats, Government Communications Headquarters and Defence Intelligence. All come under the direction of the Joint Intelligence Committee. The service has a statutory basis in the Security Service Act 1989 and the Intelligence Services Act 1994. Its remit includes the protection of British parliamentary democracy and economic interests, counter-terrorism and counter-espionage within the UK. Although mainly concerned with internal security, it does have an overseas role in support of its mission. Within the civil service community the service is colloquially known as Box 500. The service has had a national headquarters at Thames House on Millbank in London since 1995, drawing together personnel from a number of locations into a single HQ facility. Thames House is shared with the Northern Ireland Office and is also home to the Joint Terrorism Analysis Centre, a subordinate organisation to the Security Service. The service has offices across the United Kingdom including an HQ in Northern Ireland.
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