/ ˌiːvəˈnesnt; NAmE ; NAmE usually ˌev-/ adjective
( literary ) disappearing quickly from sight or memory
► evan·es·cence noun [ U ]
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WORD ORIGIN
early 18th cent. (in the sense almost imperceptible ): from Latin evanescent- disappearing, from the verb evanescere , from e- (variant of ex- ) out of + vanus empty.