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ontological argument

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noun Philosophy.
  1. an a priori argument for the existence of God, asserting that as existence is a perfection, and as God is conceived of as the most perfect being, it follows that God must exist; originated by Anselm, later used by Duns Scotus, Descartes, and Leibniz.
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Origin of ontological argument

First recorded in 1875–80
Also called ontological proof.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for ontological argument

ontological argument

noun philosophy
  1. the traditional a priori argument for the existence of God on the grounds that the concept itself necessitates existenceCompare cosmological argument, teleological argument
  2. any analogous argument from the nature of some concept to the existence of whatever instantiates it
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012