[ad. med.L. acatalēpsia, a. Gr. ἀκαταληψία incomprehensibleness, f. ἀ not + κατά thoroughly + λῆψις a seizing.] Incomprehensibility:—a term of the Skeptic philosophers; the correlative of Agnosticism, which is said of the mental faculty, while Acatalepsy is the property of the unknowable object.

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1605.  Bacon, Adv. of Learning (1640), Pref. 37. Those very schooles of Philosophers, who downe-right maintained Acatalepsie or Incomprehensibility.

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1676.  in Phil. Trans., XI. 791. The Academicks, who professing an Acatalepsy, affirmed this one thing only to be certain, Nihil certi sciri posse.

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1847.  Lewes, Hist. Philos. (1871), I. 369. Arcesilaus could from Plato’s works deduce his own theory of the incomprehensibility of all things: the acatalepsy.

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