reverberation (n.)

late 14c., "reflection of light or heat," from Old French reverberacion "great flash of light; intense quality," from Medieval Latin reverberationem (nominative reverberatio), noun of action from past participle stem of Latin reverberare "beat back, strike back, repel, cause to rebound," from re- "back" (see re-) + verberare "to strike, to beat," from verber "whip, lash, rod" (related to verbena "leaves and branches of laurel"), from *werb- "to turn, bend," from PIE root *wer- (2) "to turn, bend." Sense of "an echo" is attested from 1620s.

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