The Collaborative International Dictionary of English v.0.48:

Rapacity \Ra*pac"i*ty\ (r[.a]*p[a^]s"[i^]*t[y^]), n. [L.
   rapacitas: cf. F. rapacit['e]. See Rapacious.]
   1. The quality of being rapacious; rapaciousness;
      ravenousness; as, the rapacity of pirates; the rapacity of
      wolves.
      [1913 Webster]

   2. The act or practice of extorting or exacting by oppressive
      injustice; exorbitant greediness of gain. "The rapacity of
      some ages." --Sprat.
      [1913 Webster]

WordNet (r) 3.0 (2006):

rapacity
    n 1: extreme gluttony [syn: edacity, esurience,
         rapaciousness, rapacity, voracity, voraciousness]
    2: reprehensible acquisitiveness; insatiable desire for wealth
       (personified as one of the deadly sins) [syn: avarice,
       greed, covetousness, rapacity, avaritia]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "rapacity":
   acquisitiveness, avarice, avariciousness, avidity, avidness, claim,
   covetousness, crapulence, crapulency, cupidity, demand, edacity,
   exaction, frenzy of desire, fury of desire, gluttonousness,
   gluttony, grasping, graspingness, greed, greediness, gulosity,
   hoggishness, hyperphagia, incontinence, inordinate desire,
   insatiability, insatiable desire, intemperance, intemperateness,
   itching palm, looting, lust, omnivorousness, overeating,
   overgreediness, overindulgence, piggishness, pillaging, polyphagia,
   predacity, rapaciousness, ravenousness, sharkishness, sordidness,
   swinish gluttony, swinishness, voraciousness, voracity,
   wolfishness



The Devil's Dictionary (1881-1906):

RAPACITY, n.  Providence without industry.  The thrift of power.