the act or practice of deceiving; concealment or distortion of the truth for the purpose of misleading; duplicity; fraud; cheating: Once she exposed their deceit, no one ever trusted them again.
an act or device intended to deceive; trick; stratagem.
the quality of being deceitful; duplicity; falseness: a man full of deceit.

1225–75; Middle English deceite < Anglo-French, Old French, noun use of feminine of deceit, past participle of deceivre to deceive

nondeceit, noun

1. deception, dissimulation. 1, 3. Deceit, guile, hypocrisy, duplicity, fraud, trickery refer either to practices designed to mislead or to the qualities that produce those practices. Deceit is the quality that prompts intentional concealment or perversion of truth for the purpose of misleading: honest and without deceit. The quality of guile leads to craftiness in the use of deceit: using guile and trickery to attain one's ends. Hypocrisy is the pretense of possessing qualities of sincerity, goodness, devotion, etc.: It was sheer hypocrisy for him to go to church. Duplicity is the form of deceitfulness that leads one to give two impressions, either or both of which may be false: the duplicity of a spy working for two governments. Fraud refers usually to the practice of subtle deceit or duplicity by which one may derive benefit at another's expense: an advertiser convicted of fraud. Trickery is the quality that leads to the use of tricks and habitual deception: notorious for his trickery in business deals.

3. honesty, sincerity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deceit (dɪˈsiːt)
1.  the act or practice of deceiving
2.  a statement, act, or device intended to mislead; fraud; trick
3.  a tendency to deceive
[C13: from Old French deceite, from deceivre to deceive]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, from O.Fr. deceite, fem. pp. of deceveir (see deceive). Related: Deceitful (late 15c.); deceitfulness (c.1500).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Certainly there was no evidence of deceit or fraud or dishonesty or what have
Ayres and others are also working on technological solutions that would prevent
  this type of deceit.
Fraud, deceit, or malice had not then meddled themselves with plainness and
Sometimes there are not two sides to the story unless you see deliberate deceit
  as having equal weight with ethical actions.
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