Definition of evanescent adjective from the Oxford Advanced Learner's Dictionary

 

evanescent

 adjective
adjective
BrE BrE//ˌiːvəˈnesnt//
 
; NAmE usually NAmE//ˌevəˈnesnt//
 
, NAmE//ˌiːvəˈnesnt//
 
(literary)
 
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disappearing quickly from sight or memory Talk is evanescent, writing leaves footprints. 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’.
See the Oxford Advanced American Dictionary entry: evanescent