• (n.) A conference or conversation of philosophers at a banquet; hence, any similar gathering. • (a.) Of or pertaining to compotations and merrymaking; happening where company is drinking together; as, symposiac meetings.
Sym·po'si·ac adjective [ Latin symposiacus , Greek ....] Of or pertaining to compotations and merrymaking; happening where company is drinking together; as, symposiac meetings. « Symposiac disputations amongst my acquaintance.» Arbuthnot. 
symposiac A convivial meeting for drinking, music, and intellectual discussion among the ancient Greeks; now, a meeting or conference for the discussion of a topic or special subject.
of, pertaining to, or suitable for a symposium.