reverberation

noun

1. a reverberating or being reverberated; a reechoing or being reechoed; reflection of light or sound waves, deflection of heat or flame, etc.
2. something reverberated; reechoed sound, reflected light, etc.
3. a far-reaching effect of some event or action
4. Physics multiple reflection of sound waves in a confined area so that the sound persists after the source is cut off