Source : Webster's Revised Unabridged Dictionary (1913)

Jubilantly \Ju"bi*lant*ly\, adv.
   In a jubilant manner.

Source : WordNet®

jubilantly
     adv : in a joyous manner; "they shouted happily" [syn: {happily},
           {merrily}, {mirthfully}, {gayly}, {blithely}, {with
           happiness}] [ant: {unhappily}]