Noah Webster
Evanescence
EVANES'CENCE, noun [Latin evanescens, from evanesco; e and vanesco, to vanish, from vanus, vain, empty. See Vain.]
1. A vanishing; a gradual departure from sight or possession, either by removal to a distance, or by dissipation, as vapor.
2. The state of being liable to vanish and escape possession.