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conspiracy theory

noun
  1. a theory that explains an event as being the result of a plot by a covert group or organization; a belief that a particular unexplained event was caused by such a group.
  2. the idea that many important political events or economic and social trends are the products of secret plots that are largely unknown to the general public.
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Related formsconspiracy theorist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for conspiracy theory

conspiracy theory

noun
  1. the belief that the government or a covert organization is responsible for an event that is unusual or unexplained, esp when any such involvement is denied
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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