/vi vas"i tee, vuy-/ , n. , pl. vivacities for 1.
1. the quality or state of being vivacious.
2. liveliness; animation; sprightliness: a people noted for their vivacity.
3. a vivacious act or statement.
[ 1400-50; late ME vivacitas, equiv. to vivac- (s. of vivax long-lived, lively, equiv. to viv ( us ) alive (see VITAL) + -ax adj. suffix) + -i- -I- + -tas -TY 2 ]