fallacy

Listen:
UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈfæləsi/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈfæləsi/ ,USA pronunciation: respelling(falə sē)

Inflections of 'fallacy' (nnoun: Refers to person, place, thing, quality, etc.): nplplural noun: Noun always used in plural form--for example, "jeans," "scissors.": fallacies

WordReference Random House Learner's Dictionary of American English © 2020
fal•la•cy /ˈfæləsi/USA pronunciation   n., pl.  -cies. 
  1. a deceptive, misleading, or false notion;
    misconception:[countable]It's a fallacy to think that government will solve all our problems.
  2. Philosophy faulty or erroneous reasoning:[uncountable]The statement was based on fallacy.
  3. a misleading or unsound argument:[countable]A good logician would see the fallacies in your reasoning.

WordReference Random House Unabridged Dictionary of American English © 2020
fal•la•cy  (falə sē),USA pronunciation n., 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. Philosophy[Logic.]any of various types of erroneous reasoning that render arguments logically unsound.
  5. [Obs.]deception.
  • Middle French
  • Latin fallācia a trick, deceit, equivalent. to fallāc- (stem of fallāx) deceitful, fallacious + -ia -y3; replacing Middle English fallace
  • 1350–1400
    • 1.See corresponding entry in Unabridged misconception, delusion, misapprehension.

Collins Concise English Dictionary © HarperCollins Publishers::
fallacy /ˈfæləsɪ/ n ( pl -cies)
  1. an incorrect or misleading notion or opinion based on inaccurate facts or invalid reasoning
  2. unsound or invalid reasoning
  3. the tendency to mislead
  4. an error in reasoning that renders an argument logically invalid
Etymology: 15th Century: from Latin fallācia, from fallax deceitful, from fallere to deceive
'fallacy' also found in these entries:
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