sleight of hand.
trickery; deception.
any artful trick.

1400–50; late Middle English legerdemeyn, lygarde de mayne < Middle French: literally, light of hand

legerdemainist, noun
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World English Dictionary
legerdemain (ˌlɛdʒədəˈmeɪn)
1.  another name for sleight of hand
2.  cunning deception or trickery
[C15: from Old French: light of hand]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  legerdemain1
Part of Speech:  n
Definition:  sleight of hand; magic tricks; any illusory feat
Etymology:  French 'light of hand'
Main Entry:  legerdemain2
Part of Speech:  n
Definition:  trickery; deception
Etymology:  French 'light of hand'
Main Entry:  legerdemain3
Part of Speech:  n
Definition:  one who performs magic tricks
Etymology:  French 'light of hand'
Dictionary.com's 21st Century Lexicon
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Word Origin & History

c.1430, "conjuring tricks," from M.Fr. léger de main "quick of hand," from léger "light" in weight (from L. levis "light;" see lever) + main "hand" (from L. manus, see manual).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nobody writing today has his bag of literary tricks and can produce them with
  such effortless legerdemain.
Even in retrospect the outcome seems a bit of legerdemain.
The concept of a business model for open-source software is a contradictory
  feat of legerdemain.
The manner in which such properties are snapped up makes one think legerdemain
  is employed.
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