The Collaborative International Dictionary of English v.0.48:

Fraudulence \Fraud"u*lence\ (?; 135), Fraudulency
\Fraud"u*len*cy\, n. [L. fraudulentia.]
   The quality of being fraudulent; deliberate deceit;
   trickishness. --Hooker.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fraudulence
    n 1: a fraudulent or duplicitous representation [syn:
         fraudulence, duplicity]
    2: the quality of being fraudulent [syn: fraudulence,
       deceit]
    3: something intended to deceive; deliberate trickery intended
       to gain an advantage [syn: fraud, fraudulence, dupery,
       hoax, humbug, put-on]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "fraudulence":
   ballot-box stuffing, bunco, cardsharping, cheat, cheating,
   corruptedness, corruption, corruptness, cozenage, criminality,
   crookedness, deviousness, diddle, diddling, dishonesty, dishonor,
   dodge, evasiveness, feloniousness, fishy transaction, flam,
   flimflam, fraud, fraudulency, gerrymandering, graft, grift, gyp,
   gyp joint, illicit business, imposition, imposture, improbity,
   indirection, racket, scam, shadiness, shiftiness, slipperiness,
   swindle, trickiness, unconscientiousness, underhandedness,
   unsavoriness, unscrupulousness, unstraightforwardness