To disappear gradually or fade away, especially of something that becomes less visible or perceptible.
From Latin 'evanescere' (e- out + vanescere to vanish, from vanus empty). The word entered English in the 18th century to describe gradual disappearance.
Fog evanesces as temperature rises—the water molecules don't disappear, they just change form into invisible water vapor, which is why 'evanesce' captures something more poetic than mere vanishing.
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