noun (plural -cies) Etymology: Latin fallacia, from fallac-, fallax deceitful, from fallere to deceive Date: 14th century 1. a. obsolete guile, trickery b. deceptive appearance ; deception 2. a. a false or mistaken idea <
popular fallacies
b. erroneous character ; erroneousness 3. an often plausible argument using false or invalid inference

New Collegiate Dictionary. 2001.


Look at other dictionaries:

  • 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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