fallacy
Any error of reasoning. Reasoning may fail in many ways, and a great variety of fallacies have been distinguished and named. The main division is into formal fallacies in which something purports to be deductively valid reasoning but is not, and informal fallacies in which some other mistake is made. Such mistakes may include the introduction of irrelevancies, failure to disambiguate terms, vagueness, misplaced precision, and so on. Many fallacies that have been named are here referred to under their names: see argumentum ad …, four-term fallacy, gambler's fallacy, ignoratio elenchi, vicious circle.

Philosophy dictionary. . 2011.

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  • fallacy — fallacy, sophism, sophistry, casuistry are comparable when meaning unsound and misleading reasoning or line of argument. The same distinctions in implications and connotations are distinguishable in the corresponding adjectives fallacious,… …   New Dictionary of Synonyms

  • Fallacy — Fal la*cy (f[a^]l l[.a]*s[y^]), n.; pl. {Fallacies} (f[a^]l l[.a]*s[i^]z). [OE. fallace, fallas, deception, F. fallace, fr. L. fallacia, fr. fallax deceitful, deceptive, fr. fallere to deceive. See {Fail}.] 1. Deceptive or false appearance;… …   The Collaborative International Dictionary of English

  • fallacy — [fal′ə sē] n. pl. fallacies [ME fallace < OFr < L fallacia, deception, artifice < fallax (gen. fallacis), deceitful < fallere, to deceive: see FAIL] 1. Obs. deception 2. aptness to mislead; deceptive or delusive quality [the fallacy… …   English World dictionary

  • fallacy — I noun captio, deception, deceptive belief, delusion, deviation from truth, distortion, erroneous reasoning, erroneousness, error, fallacious argument, false appearance, falseness, falsity, faultiness, faulty reasoning, flaw in reasoning,… …   Law dictionary

  • fallacy — late 15c., deception, false statement, from L. fallacia deception, noun of quality from fallax (gen. fallacis) deceptive, from fallere deceive (see FAIL (Cf. fail)). Specific sense in logic dates from 1550s. An earlier form was fallace (c.1300),… …   Etymology dictionary

  • fallacy — [n] illusion, misconception aberration, ambiguity, artifice, bias, casuistry, cavil, deceit, deception, deceptiveness, delusion, deviation, elusion, equivocation, erratum, erroneousness, error, evasion, falsehood, faultiness, flaw, heresy,… …   New thesaurus

  • fallacy — ► NOUN (pl. fallacies) 1) a mistaken belief. 2) a failure in reasoning which makes an argument invalid. DERIVATIVES fallacious adjective. ORIGIN Latin fallacia, from fallere deceive …   English terms dictionary

  • Fallacy — In logic and rhetoric, a fallacy is usually incorrect argumentation in reasoning resulting in a misconception or presumption. By accident or design, fallacies may exploit emotional triggers in the listener or interlocutor (appeal to emotion), or… …   Wikipedia

  • fallacy — /fal euh see/, n., pl. 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.… …   Universalium

  • fallacy — n. 1) a fallacy to + int. (it s a fallacy to assume that he will help) 2) a fallacy that (it s a fallacy that all politicians are corrupt) * * * [ fæləsɪ] a fallacy that (it s a fallacy) that all politicians are corrupt a fallacy to + inf. (it s… …   Combinatory dictionary

  • fallacy — Synonyms and related words: Albigensianism, Arianism, Catharism, Ebionitism, Erastianism, Gnosticism, Jovinianism, Lollardy, Manichaeanism, Manichaeism, Monophysism, Monophysitism, Pelagianism, Waldensianism, Wyclifism, aberrancy, aberration,… …   Moby Thesaurus

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