say it: doo-PLIS-i-tee
duplicity is a noun meaning "a fraudulent or duplicitous representation". It carries 2 recorded senses.
a fraudulent or duplicitous representation
acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for duplicity come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.