Plural of colloquium; plural of colloquia: a series of formal academic discussions, lectures, or seminars.
From Latin 'colloquium' (conversation), with Latin plural '-ia'. Widely used in academic contexts since the medieval period for scholarly discussions.
Universities host colloquia constantly, yet it's a word so formal and academic that most people have no idea what it means—it's basically 'really fancy talking,' but in Latin.
Complete word intelligence in one call. Free tier — 50 lookups/day.