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Webster 1913 Edition

Noun.

The act or state of vanishing away; disappearance;

as, the

evanescence

of vapor, of a dream, of earthly plans or hopes

Rambler.

Noun.

[L. evanescens, from evanesco; e and vanesco, to vanish, from vanus, vain, empty. See Vain.]

A vanishing; a gradual departure from sight or possession, either by removal to a distance, or by dissipation, as vapor.

The state of being liable to vanish and escape possession.

See also: évanescence

evanescence ‎(countable and uncountable, plural evanescences)

The act or state of vanishing away; disappearance.
the evanescence of vapor, of a dream, of earthly plants or hopes. --Rambler
The event of fading and gradually vanishing from sight.
the evanescence of the morning mist.