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[men-das-i-tee] /mɛnˈdæs ɪ ti/
noun, plural mendacities for 2.
the quality of being mendacious; untruthfulness; tendency to lie.
an instance of lying; falsehood.
Origin of mendacity
1640-50; < Late Latin mendācitās falsehood, equivalent to Latin mendāci- (stem of mendāx) given to lying, false + -tās -ty2
Can be confused
mendacity, mendicity.
1, 2. deception, lie, untruth, deceit. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for mendacity
Contemporary Examples
Historical Examples
  • That, and his career of mendacity, would start at breakfast.

    The Cosmic Computer Henry Beam Piper
  • And Harry had the mendacity to assure her that this was a favorite habit of mine.

    Lorimer of the Northwest Harold Bindloss
  • Because Falsehood was blemished in having no feet, she was called mendacium or mendacity.

  • The yellow-press surpassed themselves in clamor and mendacity.

    Theodore Roosevelt

    Edmund Lester Pearson
  • This concluding paragraph is simply a tissue of mendacity and absurdity.

British Dictionary definitions for mendacity


noun (pl) -ties
the tendency to be untruthful
a falsehood
Derived Forms
mendacious (mɛnˈdeɪʃəs) adjective
mendaciously, adverb
mendaciousness, noun
Word Origin
C17: from Late Latin mendācitās, from Latin mendāx untruthful
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
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Word Origin and History for mendacity

"tendency to lie," 1640s, from Middle French mendacité and directly from Late Latin mendacitas "falsehood, mendacity," from Latin mendax "lying; a liar" (see mendacious).

Online Etymology Dictionary, © 2010 Douglas Harper
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