Definition of MI5 in English:


Pronunciation /ˌemˌīˈfīv/ /ˌɛmˌaɪˈfaɪv/

Translate MI5 into Spanish

proper noun

  • (in the UK) the governmental agency responsible for dealing with internal security and counter-intelligence on British territory. Formed in 1909, the agency was officially named the Security Service in 1964, but the name MI5 remains in popular use.


From Military Intelligence section 5.