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What does MI5 mean?

Looking for the meaning or definition of the word MI5? Here's what it means.

Proper noun
  1. 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.
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The author, former MI5 agent was himself imprisoned for six months for disclosing secret information to a newspaper.
A senior MI5 counter-intelligence expert has been appointed to help repel cyberwarriors working for foreign governments.
This is as if the Spycatcher affair ten years ago hadn't showed MI5 to be a nest of hard right conspirators.
Since 1994, non-classified records from MI5 have been released to the National Archives.
If admin work doesn't appeal, there are job details of the much more juicy positions at MI5 handily tucked into the brochure.
Blunt, we are told, meets Chubb, his new MI5 debriefer, for the first time six years after his 1964 confession.

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