Source : Webster's Revised Unabridged Dictionary (1913)

Ebullience \E*bul"lience\ (?; 106), Ebulliency \E*bul"lien*cy\,
   n.
   A boiling up or over; effervescence. --Cudworth.

Source : WordNet®

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