Fallacies



[fal-uh-see] /ˈfæl ə si/

noun, plural fallacies.
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.
5.
Obsolete. .
/ˈfæləsɪ/
noun (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.
(logic) an error in reasoning that renders an argument logically invalid
n.

late 15c., “deception, false statement,” from Latin fallacia “deception,” noun of quality from fallax (genitive fallacis) “deceptive,” from fallere “deceive” (see fail (v.)). Specific sense in logic dates from 1550s. An earlier form was fallace (c.1300), from Old French fallace.

A false or mistaken idea based on faulty knowledge or reasoning. For example, kings who have divorced their wives for failing to produce a son have held to the fallacy that a mother determines the sex of a child, when actually the father does. (See sex chromosomes.)

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  • Fallacious

    [fuh-ley-shuh s] /fəˈleɪ ʃəs/ adjective 1. containing a ; logically unsound: fallacious arguments. 2. deceptive; misleading: fallacious testimony. 3. disappointing; delusive: a fallacious peace. /fəˈleɪʃəs/ adjective 1. containing or involving a fallacy; illogical; erroneous 2. tending to mislead 3. delusive or disappointing: a fallacious hope adj. c.1500, from fallacy (Latin fallacia) + -ous. Related: Fallaciously; […]

  • Fallaciousness

    [fuh-ley-shuh s] /fəˈleɪ ʃəs/ adjective 1. containing a ; logically unsound: fallacious arguments. 2. deceptive; misleading: fallacious testimony. 3. disappointing; delusive: a fallacious peace. /fəˈleɪʃəs/ adjective 1. containing or involving a fallacy; illogical; erroneous 2. tending to mislead 3. delusive or disappointing: a fallacious hope adj. c.1500, from fallacy (Latin fallacia) + -ous. Related: Fallaciously; […]



  • Fallacy

    [fal-uh-see] /ˈfæl ə si/ noun, plural fallacies. 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. […]

  • Fallacy-of-composition

    noun, Logic. 1. the fallacy of inferring that a property of parts or members of a whole is also a property of the whole (opposed to ). noun the mistake of assuming that what is true of an individual or group is true for the group as a whole



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