MI5

[ em-ahy-fahyv ]

noun

1. the government's security and counterespionage service that works in liaison with Scotland Yard's Special Branch.

MI5

abbreviation for

1. Military Intelligence, section five; a former official and present-day popular name for the counterintelligence agency of the British Government

Word History and Origins

Origin of MI5¹

M(ilitary) I(ntelligence, Section) 5

Example Sentences

Are you unaware of the role agent provocateurs, special branch and MI5 have played in undermining us?

From The Daily Beast

At Risk By Stella Rimington The first novel by the best spy storyteller today, the former head of MI5.

From The Daily Beast

At the start of the war, on the orders of his Soviet handler, he successfully “coat trailed” his way into MI5.

From The Daily Beast

Arthur Owens spent years in exile, reviled as a Nazi spy, but he actually was a double agent working with MI5.

From The Daily Beast

It remains to be seen whether MI5 and MI6 will have their way.

From The Daily Beast