tri|um|phant [ traı`ʌmfənt ] adjective
1. ) showing that you are very pleased or excited about a victory or success:
a triumphant smile/laugh/yell
a ) a triumphant event is one in which someone has been successful or has won a victory:
The president made a triumphant return.
a triumphant performance
2. ) successful:
She emerged triumphant in every movie.
╾ tri|um|phant|ly adverb

Usage of the words and phrases in modern English. 2013.