du·plic·i·ty /dü-'pli-sə-tē, dyü-/ n pl -ties [Late Latin duplicitat - duplicitas duality, double-dealing, from Latin duplex twofold]1: the use of deceptive words or actions2: the use of more than one claim, allegation, or defense in a single paragraph of a pleading; esp: the improper charging of more than one offense in one count in a charging instrument (as an indictment) compare misjoinder, multiplicity
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.
artifice, casuistry, chicanery, deceitfulness, deception, dissimulation, double-dealing, duality, duplexity, equivocation, evasion, false conduct, falseheartedness, falseness, fraud, guile, hypocrisy, insincerity, perfidy, sham, trickery, two-facedness
artifice, bad faith, collusion, concealment, deceit, deception, dishonesty, false pretense, falsification, fraud, hoax, hypocrisy, imposture, improbity, indirection (deceitfulness), knavery, misstatement, pettifoggery, pretense (pretext), ruse, story (falsehood), subterfuge
Burton's Legal Thesaurus. William C. Burton. 2006
n.(1) Double-dealing.(2) In common law, the error of combining two separate causes of action in one count of a pleading or a similar mistake in a criminal pleading or legislation; now permitted under the Federal Rules of Civil Procedure.
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.