The extent to which something is substantial(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "substantiality" in a sentence
"However, ghosts, when multiplied, take on what is called substantiality -- if the solidest thing conceivable, in quasi-existence, is only concentrated phantomosity."
"The further fact that all the great "a priori" metaphysical systems have been driven by their pure logic to discredit the "substantiality" of the soul, just as they have been driven to discredit the personality of God, ought, one would think, where "radical empiricism" is concerned, to be a still stronger piece of evidence on the soul's side."
"And how we define “substantiality” is flexible enough that we can happily describe a new translation of Gilgamesh into English as “original” even though it is striving, one would hope, to be as faithful an adaptation of its source as possible."