COLLOQUIUM Meaning of COLLOQUIUM in English col ‧ lo ‧ qui ‧ um /kəˈləʊkwiəm $ -ˈloʊ-/ BrE AmE noun [countable] formal [ Date: 1500-1600 ; Language: Latin ; Origin: ⇨ ↑ colloquy ] a ↑ conference Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012