from the GNU version of the Collaborative International Dictionary of English
- n. The quality of being abstract.
from The Century Dictionary and Cyclopedia
- n. The state or quality of being abstract; a state of being in contemplation only, or not connected with any object: as, “the abstractness of the ideas themselves,” Locke, Human Understanding.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the quality of being considered apart from a specific instance or object
abstract + -ness (Wiktionary)