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

Soon afterwards Khalife contacted Britain’s spy agencies again, this time the Security Service, MI5.

From BBC

Khalife’s lawyer described him as more Scooby-Doo than 007, and painted a picture of a hapless amateur on a one-man mission to become a double agent - someone who might never have been caught had he not phoned MI5 himself.

From BBC

MI5 did not recruit him as a “double agent”, instead Khalife was arrested at his barracks on 6 January 2022.

From BBC

The young MI5 officer or financial broker who will lie, cheat and steal to protect his position.

From Los Angeles Times

Then in 1981 he was acquitted of drug charges after telling a jury at the Old Bailey he was an MI5 agent spying on IRA drug smugglers and gunrunners.

From BBC