Webster's English Dictionary

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duplicity

du.plic.i.ty \d(y)u.-'plis-*t-e-\ n 1: doubleness of thought, speech or 
   action; esp : deception by pret ending to feel and act one way while acting 
   another 2: the quality or state of being double or twofold  3: the 
   technically incorrect use of two or more distinct items (as claims,  
   charges, or defenses) in a single legal action