- an incorrect or misleading notion or opinion based on inaccurate facts or invalid reasoning
- unsound or invalid reasoning
- the tendency to mislead
- an error in reasoning that renders an argument logically invalid
WordReference Random House Learner's Dictionary of American English © 2020
fal•la•cy /ˈfæləsi/USA pronunciation n., pl. -cies.WordReference Random House Unabridged Dictionary of American English © 2020
- a deceptive, misleading, or false notion;
misconception:[countable]It's a fallacy to think that government will solve all our problems.
- Philosophy faulty or erroneous reasoning:[uncountable]The statement was based on fallacy.
- a misleading or unsound argument:[countable]A good logician would see the fallacies in your reasoning.
fal•la•cy (fal′ə sē),USA pronunciation n., pl. -cies.
- a deceptive, misleading, or false notion, belief, etc.:That the world is flat was at one time a popular fallacy.
- a misleading or unsound argument.
- deceptive, misleading, or false nature;
- Philosophy[Logic.]any of various types of erroneous reasoning that render arguments logically unsound.
- Middle French
- Latin fallācia a trick, deceit, equivalent. to fallāc- (stem of fallāx) deceitful, fallacious + -ia -y3; replacing Middle English fallace
- 1.See corresponding entry in Unabridged misconception, delusion, misapprehension.
Collins Concise English Dictionary © HarperCollins Publishers::
fallacy /ˈfæləsɪ/ n ( pl -cies)
'fallacy' also found in these entries: