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