Etymology
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evanescence (n.)

1751, "process of gradually vanishing;" see evanescent + -ence. Meaning "quality of being evanescent" is from 1830. Evanescency is attested from 1660s.

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Definitions of evanescence

evanescence (n.)
the event of fading and gradually vanishing from sight;
the evanescence of the morning mist
From wordnet.princeton.edu