ev·a·nes·cence \ˌ ̷ ̷ ̷ ̷ˈnesən(t)s\noun (-s) 1.: the process or fact of evanescing : a vanishing away < the possible evanescence of her passion for him — Thomas Hardy > 2.: evanescent quality < the fleeting evanescence of all things that are — J.L.Lowes >