Emily Dickinson Lexicon

VI-VAC'I-TY, n. [Fr. vivacité; L. vivacitas.]

1. Liveliness; sprightliness of temper or behavior; as, a lady of great vivacity.
2. Air of life and activity; as, vivacity of countenance.
3. Life; animation; spirits; as, the vivacity of a discourse.
4. Power of living. [Not used.] – Boyle.
5. Longevity. [Not in use.] – Brown.