ephem·er·al·i·ty \ə̇ˌfeməˈraləd.ē, ēˌf-, (ˌ)eˌf-, -ətē, -i, chiefly Brit -fēm-\noun (-es) 1.: the quality or state of being ephemeral < a sense of ephemerality, of pale erratic fragility — D.H.Lawrence > 2.: ephemeral II — usually used in plural < “Barrack-Room Ballads” … clever ephemeralities — Henry Austin >