Wiktionary:Word of the day/2020/February 29

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evanescent adj

Disappearing, vanishing. (electromagnetism) 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. (mathematics) Of a number or value: diminishing to the point of reaching zero as a limit; infinitesimal. Barely there; almost imperceptible. Ephemeral, fleeting, momentary. (botany) Of plant parts: shed after a period. Today is the leap day of 2020, which is a leap year.

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