MI5

MI5

[em-ahy-fahyv]
noun (in Great Britain)
the government's security and counterespionage service that works in liaison with Scotland Yard's Special Branch.

Origin:
M(ilitary) I(ntelligence, Section) 5

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World English Dictionary
MI5
 
abbreviation for
Military Intelligence, section five; a former official and present-day popular name for the counterintelligence agency of the British Government

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Mi5 is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a scrap or morsel of food left at a meal.
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