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A fallacious or illogical argument or conclusion.

[Late Latin paralogismus, from Greek paralogismos, from paralogos, unreasonable : para-, beyond; see para-1 + logos, reason; see leg- in Indo-European roots.]

pa·ral′o·gist n.
pa·ral′o·gis′tic adj.


1. (Logic) logic psychol an argument that is unintentionally invalid. Compare sophism
2. (Psychology) logic psychol an argument that is unintentionally invalid. Compare sophism
3. any invalid argument or conclusion
[C16: via Late Latin from Greek paralogismos, from paralogizesthai to argue fallaciously, from para-1 + -logizesthai, ultimately from logos word]
paˈralogist n
paˌraloˈgistic adj

paralogism, paralogy, paralogia

a method or process of reasoning which contradicts logical rules or formulas, especially the use of a faulty syllogism (the formal fallacy). — paralogist, n. — paralogistic, adj.
See also: Argumentation
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.paralogism - an unintentionally invalid argument
fallacy, false belief - a misconception resulting from incorrect reasoning
References in classic literature ?
When the Inquiring Soul had completed his course of instruction he declared himself the Ahkoond of Swat, fell into the baleful habit of standing on his head, and swore that the mother who bore him was a pragmatic paralogism.
Accordingly, seeing that our senses sometimes deceive us, I was willing to suppose that there existed nothing really such as they presented to us; and because some men err in reasoning, and fall into paralogisms, even on the simplest matters of geometry, I, convinced that I was as open to error as any other, rejected as false all the reasonings I had hitherto taken for demonstrations; and finally, when I considered that the very same thoughts(presentations) which we experience when awake may also be experienced when we are asleep, while there is at that time not one of them true, I supposed that all the objects (presentations) that had ever entered into my mind when awake, had in them no more truth than the illusions of my dreams.
Although they build on results of previous chapters, each can also usefully be read in isolation, as they each contain a history of German rational psychology with respect to the topic of the relevant Paralogism and then an interpretation of that Paralogism in light of that history.
PARALOGISM A False reasoning B Mathematics of parallels C On military lines who am I?
Had Korzybski introduced general semantics at some point over the last few decades, he no doubt would have dubbed it post-Aristotelian instead, and, indeed, general semantics presages many basic elements of postmodernism, including paralogism (in the sense of going beyond logic--which was after all first codified by Aristotle--and its established rules and formulas).
Opened to the dizzying possibilities of syntax and syllogism, the pornographic image may be heightened to the point where it metamorphizes into pure paralogism.
Here, Kant's rejection of knowledge about a Cartesian soul-substance in the First Paralogism is particularly engaging, as is the discussion of the antinomies.
As for the critical period, Kant responds to it only in the Fourth Paralogism of the first edition of the Critique and in the Refutation of Idealism of the second edition.
This essay examines Kant's account in the First Paralogism of how these two elements combine to produce the doctrine that the soul is a substance.