• the official British organization that is responsible for protecting military and political secrets


    Mi5 meaning & definition 1 of Mi5.


  • (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.

    Mi5 meaning & definition 2 of Mi5.

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