The Collaborative International Dictionary of English v.0.48:

Substantiality \Sub*stan`ti*al"i*ty\, n.
   The quality or state of being substantial; corporiety;
   materiality.
   [1913 Webster]

         The soul is a stranger to such gross substantiality.
                                                  --Glanvill.
   [1913 Webster]

WordNet (r) 3.0 (2006):

substantiality
    n 1: the quality of being substantial or having substance [syn:
         substantiality, substantialness, solidness] [ant:
         insubstantiality]

Moby Thesaurus II by Grady Ward, 1.0:

134 Moby Thesaurus words for "substantiality":
   abundance, affluence, ample sufficiency, ampleness, amplitude,
   aplomb, authenticity, authoritativeness, authority, avalanche,
   balance, balanced personality, being, bodiliness, bonanza,
   bountifulness, bountiousness, bumper crop, calculability, cogency,
   concreteness, constancy, cool, copiousness, corporality,
   corporeality, corporealness, corporeity, dependability, embodiment,
   ens, entity, equilibrium, esse, essence, existence, extravagance,
   exuberance, faithworthiness, fastness, fertility, firmness, flesh,
   flesh and blood, flood, flow, foison, force, full measure,
   fullness, generosity, generousness, great abundance, great plenty,
   gush, homeostasis, imperturbability, invariability, invincibility,
   justness, landslide, lavishness, liberality, liberalness, life,
   lots, luxuriance, materiality, materialness, maximum,
   more than enough, much, myriad, myriads, nerve, numerousness,
   occurrence, opulence, opulency, outpouring, overflow, physicality,
   physicalness, plenitude, plenteousness, plentifulness, plenty,
   predictability, presence, prevalence, prodigality, productiveness,
   profuseness, profusion, quantities, reliability, repleteness,
   repletion, rich harvest, rich vein, richness, riot, riotousness,
   rootedness, sang-froid, scads, secureness, security, shower,
   solidity, soundness, spate, stability, stable equilibrium,
   stable state, staunchness, steadfastness, steadiness,
   steady nerves, steady state, stream, subsistence, substantialness,
   superabundance, teemingness, trustworthiness, undeflectability,
   unerringness, uniformity, unshakable nerves, unshakableness,
   validity, wealth, weight