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noun (in Great Britain)
  1. the government's secret intelligence service.
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Origin of MI6

M(ilitary) I(ntelligence, Section) 6
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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abbreviation for
  1. Military Intelligence, section six; a former official and present-day popular name for the intelligence and espionage agency of the British Government
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012