MI5

English

Etymology

Abbreviation of Military Intelligence, Section Five.

Proper noun

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.
    • 2025 July 6, Daniel De Simone, “How MI5 piled falsehood on falsehood in court in the case of a spy who abused women”, in BBC News‎[1], retrieved 6 July 2025:
      The service aggressively maintained its position until I produced evidence proving it was untrue - including a recording of one of the calls with a senior MI5 officer.

Synonyms

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Further reading

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