Meanings
- The overseas intelligence agency of the United Kingdom, whose primary function is to spy on foreign governments and terror groups located abroad. Formally called the Secret Intelligence Service (SIS).
Zakharova also made light of Moore’s claims that Russia will not be able to regain momentum in the war after the MI6 chief said he was”optimistic”^([sic]) Ukraine would prevail against the Russian invasion.
2023 July 19, Nick Paton Walsh and Katharina Krebs, “MI6 chief makes open plea to Russians to spy for UK”, in CNNSynonyms: Six, 6, Secret Intelligence Service, SIS
Synonyms & antonyms
proper nounThe overseas intelligence agency of the United Kingdom, whose primary function is to spy on foreign governments and terror groups located abroad. Formally called the Secret Intelligence Service (SIS).
Origin
Abbreviation of Military Intelligence, Section Six.
Full word history & related roots →Cite this entry
MI6. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/MI6
“MI6.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/MI6. Accessed November 2, 2026.
WatkinsX Dictionary, s.v. “MI6,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/MI6.
Source: MI6 on Wiktionary, CC BY-SA 4.0.