noun, plural men·dac·i·ties for 2.

  1. the quality of being mendacious; untruthfulness; tendency to lie.
  2. an instance of lying; falsehood.

noun plural -ties

  1. the tendency to be untruthful
  2. a falsehood

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

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