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From The Collaborative International Dictionary of English v.0.48:
Vivacity \Vi*vac"i*ty\, n. [L. vivicitas: cf. F. vivacit['e].] The quality or state of being vivacious. Specifically: [1913 Webster] (a) Tenacity of life; vital force; natural vigor. [Obs.] [1913 Webster] The vivacity of some of these pensioners is little less than a miracle, they lived so long. --Fuller. [1913 Webster] (b) Life; animation; spiritedness; liveliness; sprightliness; as, the vivacity of a discourse; a lady of great vivacity; vivacity of countenance. [1913 Webster] Syn: Liveliness; gayety. See Liveliness. [1913 Webster]