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conspiracy  (conspiracies plural )
1  n-var Conspiracy is the secret planning by a group of people to do something illegal. 
Seven men, all from Bristol, admitted conspiracy to commit arson...  
2  n-count A conspiracy is an agreement between a group of people which other people think is wrong or is likely to be harmful. 
There was no evidence to link the brigade to any conspiracy against Mr Bush.  


conspiracy theory   (conspiracy theories plural )A conspiracy theory is a belief that a group of people are secretly trying to harm someone or achieve something. You usually use this term to suggest that you think this is unlikely.  n-count 
Did you ever swallow the conspiracy theory about Kennedy?