A glowing or shining brightly; a state of being incandescent or brilliantly bright.
From Latin ex- (out) + candescere (to glow, from candere, to shine). Related to 'candescent' and 'incandescent.'
Incandescent light bulbs glow with heat, but excandescence specifically refers to that extreme radiance—it's the word for what happens when things get so hot they become pure light.
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