Fleetingness
The Century Dictionary and Cyclopedia
noun.
The character of being fleeting; transientness; evanescence.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
The quality of being
fleeting
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the property of lasting for a very short time
Word Usage
"The more meditative and engaged we are, the more we sense the fragility and fleetingness of things."
Hypernym
Words that are more generic or abstract
transience
transiency
transitoriness