You use victorious to describe someone who has won a victory in a struggle, war, or competition. In 1978 he played for the victorious Argentinian side in the World Cup. = winning. having won a victory, or ending in a victory
Of or pertaining to victory, or a victor' being a victor; bringing or causing a victory; conquering; winning; triumphant; as, a victorious general; victorious troops; a victorious day