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From The Collaborative International Dictionary of English v.0.48:
Vivacious \Vi*va"cious\ (?; 277), a. [L. v['i]vax, -acis, fr. vivere to live. See Vivid.] 1. Having vigorous powers of life; tenacious of life; long-lived. [Obs.] [1913 Webster] Hitherto the English bishops have been vivacious almost to wonder. . . . But five died for the first twenty years of her [Queen Elizabeth's] reign. --Fuller. [1913 Webster] The faith of Christianity is far more vivacious than any mere ravishment of the imagination can ever be. --I. Taylor. [1913 Webster] 2. Sprightly in temper or conduct; lively; merry; as, a vivacious poet. "Vivacious nonsense." --V. Knox. [1913 Webster] 3. (Bot.) Living through the winter, or from year to year; perennial. [R.] [1913 Webster] Syn: Sprightly; active; animated; sportive; gay; merry; jocund; light-hearted. [1913 Webster] -- Vi*va"cious*ly, adv. -- Vi*va"cious*ness, n. [1913 Webster]