vastness

from WordNet (r) 3.0 (2006)

vastness
    n 1: unusual largeness in size or extent or number [syn:
         {enormousness}, {grandness}, {greatness}, {immenseness},
         {immensity}, {sizeableness}, {vastness}, {wideness}]

from The Collaborative International Dictionary of English v.0.48

Vastness \Vast"ness\, n.
   The quality or state of being vast.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

31 Moby Thesaurus words for "vastness":
      ampleness, amplitude, boundlessness, bulk, enormity, enormousness,
      expanse, formidableness, fullness, gigantism, grandeur, grandness,
      great scope, greatness, hugeness, immensity, infinity, intensity,
      largeness, magnitude, might, mightiness, monstrosity,
      monstrousness, muchness, plenitude, power, prodigiousness,
      strength, stupendousness, tremendousness