The Collaborative International Dictionary of English v.0.48:

Prodigality \Prod`i*gal"i*ty\, n. [F. prodigalit['e], L.
   prodigalitas. See Prodigal.]
   Extravagance in expenditure, particularly of money; excessive
   liberality; profusion; waste; -- opposed to frugality,
   economy, and parsimony."The prodigality of his wit."
   --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prodigality
    n 1: the trait of spending extravagantly [syn: extravagance,
         prodigality, profligacy]
    2: excessive spending [syn: extravagance, prodigality,
       lavishness, highlife, high life]

Moby Thesaurus II by Grady Ward, 1.0:

217 Moby Thesaurus words for "prodigality":
   abundance, affluence, aggrandizement, amorality, ample sufficiency,
   ampleness, amplification, amplitude, avalanche, backsliding,
   ballyhoo, big talk, blowing up, bonanza, bounteousness,
   bountifulness, bountiousness, bounty, bumper crop, burlesque,
   caricature, carnality, cloud of words, copiousness, crapulence,
   crapulency, crapulousness, criminality, delinquency, deluge,
   diffuseness, diffusion, diffusiveness, dilatation, dilation,
   dissipation, drunkenness, effusion, effusiveness,
   embarras de richesses, enhancement, enlargement, enough, evil,
   evil nature, exaggerating, exaggeration, excess, excessiveness,
   exorbitance, expansion, extravagance, extravagancy, extreme,
   exuberance, fecundity, fertility, flood, flow, fluency, foison,
   formlessness, full measure, fullness, generosity, generousness,
   gluttony, grandiloquence, great abundance, great plenty, gush,
   gushing, heightening, huckstering, hyperbole, hyperbolism,
   immoderacy, immoderateness, immoderation, immorality, improvidence,
   impurity, incontinence, indiscipline, indulgence, inflation,
   inordinacy, inordinateness, intemperance, intemperateness,
   inundation, landslide, lavishness, liberality, liberalness,
   logorrhea, lots, luxuriance, luxuriousness, luxury, macrology,
   magnification, maximum, money to burn, moral delinquency,
   more than enough, much, myriad, myriads, numerousness, opulence,
   opulency, outpour, outpouring, overabundance, overaccumulation,
   overbounteousness, overcopiousness, overdoing, overdose,
   overemphasis, overestimation, overflow, overindulgence, overkill,
   overlavishness, overluxuriance, overmeasure, overmuchness,
   overnumerousness, overplentifulness, overplenty, overpopulation,
   overprofusion, overstatement, oversufficiency, oversupply,
   palilogy, peccability, plenitude, plenteousness, plentifulness,
   plenty, pleonasm, plethora, prevalence, productiveness,
   productivity, profligacy, profuseness, profusion, prolificacy,
   prolificity, puffery, puffing up, quantities, rampancy, rankness,
   recidivism, recklessness, redundancy, reiteration, reiterativeness,
   repetition for effect, repetitiveness, repleteness, repletion,
   rich harvest, rich vein, richness, riot, riotousness, scads,
   self-indulgence, sensationalism, shower, spate, squandering,
   stream, stretching, substantiality, substantialness, sumptuousness,
   superabundance, superfluity, superflux, superlative, swinishness,
   talkativeness, tall talk, tautology, teemingness, tirade, too much,
   too-muchness, touting, travesty, unangelicalness, unchastity,
   uncleanness, unconstraint, uncontrol, ungodliness, ungoodness,
   unmorality, unrestraint, unrighteousness, unsaintliness,
   unvirtuousness, vice, viciousness, wantonness, waste, wastefulness,
   waywardness, wealth, wrongdoing