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" (see vibrate). Meaning "vigorous, full of life" is first recorded 1860. Related: Vibrantly; vibrancy.[vibrant etymology, vibrant origin, 英语词源]