ephemerality ‎(countable and uncountable, plural ephemeralities)

  1. (uncountable) The state or condition of being ephemeral; transience.
  2. (countable) Something that is ephemeral.
    • 1961, Lewis Mumford, The City in History, Harcourt, Brace & World, p. 242:
      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.