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From The Collaborative International Dictionary of English v.0.48:
Evanescent \Ev`a*nes"cent\, a. [L. evanescens, -entis, p. pr. of evanescere.] 1. Liable to vanish or pass away like vapor; vanishing; fleeting; as, evanescent joys. [1913 Webster] So evanescent are the fashions of the world in these particulars. --Hawthorne. [1913 Webster] 2. Vanishing from notice; imperceptible. [1913 Webster] The difference between right and wrong, in some petty cases, is almost evanescent. --Wollaston. [1913 Webster]