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Meaning of fallacy

fal•la•cy

Pronunciation: (fal'u-sē), [key]
— pl. -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. any of various types of erroneous reasoning that render arguments logically unsound.
  5. deception.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
fallacious fallal