Source : Webster's Revised Unabridged Dictionary (1913)

Exuberance \Ex*u"ber*ance\, n. [L. exuberantia: cf. F.
   exub['e]rance.]
   The state of being exuberant; an overflowing quantity; a
   copious or excessive production or supply; superabundance;
   richness; as, an exuberance of joy, of fancy, or of foliage.

   Syn: Abundance; superabundance; excess; plenty; copiousness;
        profusion; richness; overflow; overgrowth; rankness;
        wantonness. See {Abundance}.

Source : WordNet®

exuberance
     n 1: joyful enthusiasm
     2: overflowing with enthusiasm [syn: {enthusiasm}, {ebullience}]