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

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

He said only the public inquiry, which questioned key MI5 officers in secret, had been able to obtain a clear picture about the lead-up to the bombing.

From BBC

In the months before the bombing, MI5 received two pieces of information about Abedi.

From BBC

The public inquiry report revealed that the MI5 officers who handled the intelligence had understood, at the time, that both pieces could relate to terrorism.

From BBC

MI5 showed "institutional defensiveness rather than candour" after the Manchester Arena attack and for years continued to present an "inaccurate picture" of what it had known about the suicide bomber, a tribunal has been told.

From BBC