[ trahy-uh-lawg, -log ]
/ ˈtraɪ əˌlɔg, -ˌlɒg /
a discussion or conversation in which three persons or groups participate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for trialogue
These three characters carried on a conversation (trialogue) in which great truths were boldly professed.History of the Reformation in the Sixteenth Century, Volume V|J. H. Merle d'Aubigné