evanescent

adjective
1

Disappearing, vanishing.

2

Of an oscillating electric or magnetic field: not propagating as an electromagnetic wave but having its energy spatially concentrated in the vicinity of its source.

3

Of a number or value: diminishing to the point of reaching zero as a limit; infinitesimal.

4

Barely there; almost imperceptible.

5

Ephemeral, fleeting, momentary.

6

Of plant parts: shed after a period.

Source: https://en.wiktionary.org/wiki/evanescent

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