conspiracy theories

Noun

conspiracy theory (plural conspiracy theories)

1. (derogatory) Hypothetical speculation that is commonly considered untrue or outlandish.
   • Before discussing Norman Mailer's magisterial bid for dominance in this field, I want to use Richard Cordon to anticipate a common liberal objection - the objection that all this is 'conspiracy theory'. One has become used to this stolid, complacent return serve: so apparently grounded in reason...1993, Christopher Hitchens, For the Sake of Argument
2. Used other than figuratively or idiomatically: see conspiracy, theory. A hypothesis that posits conspiracy or collusion.
   • England has had quite enough to do in Europe and Asia, without going out of her way to meddle with America. It was a physical and moral impossibility that she could be carrying on a gigantic conspiracy against us. But our masses, having only a rough general knowledge of foreign affairs, and not...1863 January 11, Charles Astor Bristed, “English Insincerity on the Slavery Question. [Letter to the Editor]”, in The New York Times, page 3