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liar paradox

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noun
  1. a logical paradox that results from consideration of statements of the form “This statement is false.” If the statement is true, then it is false, whereas if it is false, then it is true.
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Origin of liar paradox

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for liar paradox

liar paradox

noun
  1. logic the paradox that this statement is false is true only if it is false and false only if it is true: attributed to Epimenides the Cretan in the form all Cretans are liars
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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