A sound that persists or echoes after the primary sound source has stopped.
Compound of 'after' and 'sound' (from Old English 'sund'). The term appears in acoustic and poetic contexts to describe lingering auditory impressions.
Reverberation in concert halls and cathedrals is literally aftersound—the sound waves bouncing off surfaces for seconds after the note ends, which is why some venues sound magical and others sound dead!
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