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Definition of MI6 noun from the Oxford Advanced Learner's Dictionary

 

MI6

 noun
noun
BrE BrE//ˌem aɪ ˈsɪks//
 
; NAmE NAmE//ˌem aɪ ˈsɪks//
 
[uncountable]
 
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the British government organization that deals with national security from outside Britain. Its official name is ‘the Secret Intelligence Service’. Culture MI6 is an abbreviation of Military Intelligence section 6. Like that of MI5, role of MI6 changed in the early 1990s and its activities became much less secret.