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mendacity (n.)

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

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Definitions of mendacity from WordNet

mendacity (n.)
the tendency to be untruthful;
From wordnet.princeton.edu