secret intelligence service

Noun
  1. The government agency in the United Kingdom that is responsible for internal security and counterintelligence overseas (synset 108363582)
    domain region: britain, great britain, u.k., uk, united kingdom, united kingdom of great britain and northern ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
    is a type of: international intelligence agency - an intelligence agency outside the United States
    same as: mi, military intelligence section 6

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