The Collaborative International Dictionary of English v.0.48:

Circumvention \Cir`cum*ven"tion\, n. [L. circumventio.]
   The act of prevailing over another by arts, address, or
   fraud; deception; fraud; imposture; delusion.
   [1913 Webster]

         A school in which he learns sly circumvention.
                                                  --Cowper.
   [1913 Webster]

WordNet (r) 3.0 (2006):

circumvention
    n 1: the act of evading by going around

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "circumvention":
   avoidance, avoiding reaction, bamboozlement, befooling, bluffing,
   buck-passing, calculated deception, conning, deceiving, deception,
   deceptiveness, defense mechanism, defrauding, delusion,
   delusiveness, dodge, duck, dupery, elusion, elusiveness,
   enmeshment, ensnarement, entanglement, entrapment, equivocation,
   escape, evasion, evasive action, evasiveness, fallaciousness,
   fallacy, falseness, flimflam, flimflammery, foiling, fond illusion,
   fooling, forbearance, forestalling, forestallment, frustration,
   getting around, getting round, hallucination, hoodwinking,
   illusion, jink, kidding, mirage, neutrality, nonintervention,
   noninvolvement, outguessing, outmaneuvering, outwitting,
   overreaching, passing the buck, phantasm, prevention, putting on,
   refraining, self-deception, shunning, shunting off, shy, sidestep,
   sidetracking, slip, snow job, song and dance, spoofery, spoofing,
   subterfuge, swindling, the runaround, the slip, thwarting,
   trickiness, tricking, victimization, vision, willful misconception,
   wishful thinking, zigzag



Bouvier's Law Dictionary, Revised 6th Ed (1856):

CIRCUMVENTION, torts, Scotch law. Any act of fraud whereby a person is
reduced to a deed by decree. Tech. Dict. It has the same sense in the civil
law. Dig. 50, 17, 49 et 155; Id. 12, 6, 6, 2; Id. 41, 2, 34. Vide
Parphrasis.