fallacy

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fal·la·cy / ˈfaləsē/ • n. (pl. -cies) a mistaken belief, esp. one based on unsound argument. ∎  Logic a failure in reasoning that renders an argument invalid. ∎  faulty reasoning; misleading or unsound argument: the potential for fallacy which lies behind the notion of self-esteem.DERIVATIVES: fal·la·cious / fəˈlāshəs/ adj.fal·la·cious·ness / fəˈlāshəsnəs/ n.

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