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double negation

noun
1.
(logic) the principle that a statement is equivalent to the denial of its negation, as it is not the case that John is not here meaning John is here
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for double negation
Historical Examples
  • There is much significance in the double negation of my text, 'Neither circumcision nor uncircumcision.'

    Expositions of Holy Scripture Alexander Maclaren

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