ephemerality

noun

1. (uncountable)The state or condition of being ephemeral; transience.

   “But in that quest, we sometimes lose sight of a central tenet: Nature’s ephemerality makes it all the more enchanting.”

2. (countable)Something that is ephemeral.

   “So, too, the multiplication of bathrooms and the over-expenditure on broadly paved motor roads, and above all, the massive collective concentration on glib ephemeralities of all kinds, performed with supreme technical audacity.”