Meaning of MI6 in English:
MI6
Translate MI6 into Spanish
proper noun
(in the UK) the governmental agency responsible for dealing with matters of internal security and counter-intelligence overseas. Formed in 1912, the agency was officially named the Secret Intelligence Service in 1964, but the name MI6 remains in popular use.
Origin
From Military Intelligence section 5.
Are You Learning English? Here Are Our Top English Tips