Webster's Revised Unabridged Dictionary · 1913

duplicity

duplicity , noun

[French duplicité, Latin duplicitas, from duplex double. See Duplex.]

1.
Doubleness; a twofold state. [Archaic]
Do not affect duplicities nor triplicities, nor any certain number of parts in your division of things. — I. Watts
2.
Doubleness of heart or speech; insincerity; a sustained form of deception which consists in entertaining or pretending to entertain one set of feelings, and acting as if influenced by another; bad faith.
Far from the duplicity wickedly charged on him, he acted his part with alacrity and resolution. — Burke
3.
(a) (Law) The use of two or more distinct allegations or answers, where one is sufficient.
(b)
(Law) In indictments, the union of two incompatible offenses. — Blackstone