Etymology
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afterglow (n.)

also after-glow, "glow in the western sky after sunset," 1829, from after + glow (n.).

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Definitions of afterglow

afterglow (n.)
a glow sometimes seen in the sky after sunset;
afterglow (n.)
the pleasure of remembering some pleasant event;
he basked in the afterglow of his victory
From wordnet.princeton.edu