Definition of duplicity

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< duplicitous

Du Pont de Nemours, Pierre Samuel >

du·plic·i·ty    (d-pls-t, dy-) KEY 

NOUN:
pl. du·plic·i·ties

1. 1. Deliberate deceptiveness in behavior or speech.
   2. An instance of deliberate deceptiveness; double-dealing.
2. The quality or state of being twofold or double.

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ETYMOLOGY:
Middle English duplicite, from Old French, from Late Latin duplicits, doubleness, from Latin duplex, duplic-, twofold; see dwo- in Indo-European roots