The Collaborative International Dictionary of English v.0.48:

Exuberate \Ex*u"ber*ate\, v. i. [L. exuberatus, p. p. of
   exuberare. See Exuberant, n.]
   To abound; to be in great abundance. [Obs.] --Boyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

exuberate
    v 1: to express great joy; "Who cannot exult in Spring?" [syn:
         exuberate, exult, rejoice, triumph, jubilate]