trialogue/ˈtɹaɪəlɒɡ/EtymologyMedieval Latin trialogus. By surface analysis, tri- + -alogue. Note that official documents of the European Union use the spelling trilogue (perhaps influenced by the French spelling).trialogue means A conversation or talk between three people. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounA conversation or talk between three people.“Only for a short while was he kept waiting. The trialogue came to a close, followed by a brief interval of silence—at the end of which the canoe once more made its appearance upon the open water of the lagoon.”An informal tripartite meeting attended by representatives of the European Parliament, the Council of the European Union, and the European Commission.