1550s, "agitated;" 1610s, "vibrating" (especially "vibrating so as to produce sound," of a string, etc.), from Latin vibrantem (nominative vibrans) "swaying," present participle of vibrare "move to and fro" (from PIE root *weip- "to turn, vacillate, tremble ecstatically"). Meaning "vigorous, full of life" is first recorded 1860. Related: Vibrantly; vibrancy.
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