Security Service

Thesaurus

Noun

1.

Security Service - the government agency in the United Kingdom that is responsible for internal security and counterintelligence on British territory Military Intelligence Section 5, MI international intelligence agency - an intelligence agency outside the United States 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