MI5

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MI5

Where it comes from

Abbreviation of Military Intelligence, Section Five.

proper noun

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. 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.
Similar: Five, 5, Security Service

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MLA

"MI5." Wiktionary, via Micwyn, micwyn.com/word/mi5. Accessed 6 Nov. 2026.

APA

MI5. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/mi5

Chicago

"MI5." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/mi5.

BibTeX

@misc{mi5_2026,
  title = {MI5},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/mi5},
  urldate = {2026-11-06}
}