men·dac·i·ty \menˈdasəd.ē, -daas-, -sətē, -i\noun (-es) Etymology: Late Latin mendacitas, from Latin mendac-, mendax + -itas -ity : the quality or state of being mendacious : the practice or an instance of lying : falsehood < blushed … at his own mendacity — J.D.Beresford > < man's peculiar type of mendacity — Leo Stein >