E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A word formed from thriambos, the Dionysiac hymn.
Some have assigned the origin of triumphal processions to the mythic pomps of Dionysus, after his conquests in the East, the very word triumph being the Dionysiac hymn.Pater: Marius the Epiourean, chap. xii.