The Collaborative International Dictionary of English v.0.48:
Jubilantly \Ju"bi*lant*ly\, adv. In a jubilant manner. [1913 Webster]WordNet (r) 3.0 (2006):
jubilantly adv 1: in a joyous manner; "they shouted happily" [syn: happily, merrily, mirthfully, gayly, blithely, jubilantly] [ant: unhappily]