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fal·la·cy /ˈfæləsi/ Pronunciation Key - Show Spelled Pronunciation[fal-uh-see] Pronunciation Key - Show IPA Pronunciation
–noun, plural -cies. 1. a deceptive, misleading, or false notion, belief, etc.: That the world is flat was at one time a popular fallacy.
2. a misleading or unsound argument.
3. deceptive, misleading, or false nature; erroneousness.
4. Logic. any of various types of erroneous reasoning that render arguments logically unsound.

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