The Collaborative International Dictionary of English v.0.48:

Incorporeality \In`cor*po`re*al"i*ty\, n.
   The state or quality of being incorporeal or bodiless;
   immateriality; incorporealism. --G. Eliot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incorporeality
    n 1: the quality of not being physical; not consisting of matter
         [syn: immateriality, incorporeality] [ant:
         corporality, corporeality, materiality,
         physicalness]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "incorporeality":
   airiness, airy nothing, bodilessness, ethereality, fineness,
   flimsiness, ghostliness, immateriality, immaterialness,
   impalpability, imponderability, incorporeity, inextension,
   insolidity, insubstantiality, intangibility, mistiness,
   nonexteriority, occult phenomena, occultism, otherworldliness,
   psychical research, psychicism, psychics, psychism, rareness,
   rarity, shadowiness, slightness, spirit world, spirituality,
   spirituousness, subtility, subtilty, subtlety, supernaturalism,
   tenuity, tenuousness, the occult, thinness, unconcreteness,
   unearthliness, unreality, unsolidity, unsubstantiality,
   unsubstantialness, unworldliness, vagueness