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EnglishEdit

EtymologyEdit

Originally an abbreviation for Military Intelligence, division five.

Proper nounEdit

MI5

  1. The domestic intelligence and counter-espionage 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.

SynonymsEdit

Related termsEdit

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Further readingEdit