catflap.org Online Dictionary Query

  MI5
     n.
     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.

  MI5
     n.
     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.

  MI5
     n.
     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.

  MI5
     n.
     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.

  MI5 /mˈaɪ fˈaɪv/
   [coll.] britischer Inlandsgeheimdienst
     Synonym: Security Service
  
   see: domestic intelligence service, domestic intelligence agency, domestic secret service, domestic intelligence agencies, Australian Security Intelligence Organisation, Canadian Security Intelligence Service, Swiss domestic and foreign intelligence service
  

  MI-5 /mˈaɪ fˈaɪv/
  Nachrichtendienst und Verfassungsschutzbehörde Großbritanniens
     Synonym: Security Service
  
   see: intelligence service, intelligence agency, intelligence, secret service, intelligence services, intelligence agencies, secret services, Central Intelligence Agency, Government Communications Headquarters, Defense Intelligence Agency
  
           Note: Military Intelligence, Section 5

  MI5 /mˈaɪ fˈaɪv/
   [coll.] britische Staatsschutzbehörde
     Synonym: Security Service
  
   see: national security service, national security agency, National Security Agency