duplicity

American Heritage® Dictionary of the English Language, Fourth Edition

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

Century Dictionary and Cyclopedia

1. n. The state of being double; doubleness.
2. n. Doubleness of heart or speech; the acting or speaking differently in relation to the same thing at different times or to different persons, with intention to deceive; the practice of deception by means of dissimulation or double-dealing.
3. n. In law, the pleading of two or more distinct matters together as if constituting but one. Synonyms Guile, deception, hypocrisy, artifice, chicanery.
4. n. In biology, the division of a part of the body of an organism, such as a limb or a digit, into two equivalent parts which may be regarded as equivalent to normal single members.

Wiktionary

1. n. Intentional deceptiveness; double-dealing.

GNU Webster's 1913

1. n. Archaic Doubleness; a twofold state.
2. n. 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.
3. n. The use of two or more distinct allegations or answers, where one is sufficient.
4. n. In indictments, the union of two incompatible offenses.

WordNet 3.0

1. n. a fraudulent or duplicitous representation
2. n. acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another