the GNU version of the Collaborative International Dictionary of English
n. The state or quality of being invisible; also, that which is invisible.
The Century Dictionary and Cyclopedia
n. The state of being invisible; incapacity of being seen.
n. That which is invisible.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the quality of not being perceivable by the eye
Word Usage
"Sands says that e-invoicing has helped Memorial Hermann reduce what he calls the invisibility of costs (the time between when invoices come in, make their way into the system and get processed for payment) from 60-to-90 days to 15-to-30 days."