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noun conspiracy pronunciation in American English /kənˈspɪrəsi/ 
Word Forms
  1. 1
    [countable] a secret plan by a group of people to do something bad or illegal, especially in politics
    conspiracy against:

    a conspiracy against the party leadership

    conspiracy to do something:

    evidence of conspiracies to assassinate the president

    Synonyms and related words for this sense of conspiracy
  2. 2
    [uncountable] legal the legal offense of planning a serious crime

    The charges against them include conspiracy to smuggle heroin.


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