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English definition of “conspiracy theory”

conspiracy theory

noun [C]    
a belief that an unpleasant event or situation is the result of a secret plan made by powerful peoplePlotting and trappingPlanning, expecting and arrangingCheating and tricking conspiracy theorist     noun [C] someone who believes in a conspiracy theoryPlotting and trappingPlanning, expecting and arrangingCheating and tricking
(Definition of conspiracy theory noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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