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plural symposiums or symposia
A conference or other meeting for discussion of a topic, especially one in which the participants make presentations. examples
A drinking party in Ancient Greece, especially one with intellectual discussion. examples
A collection of essays, articles or papers on a particular subject by a number of contributors. quotations examples
THE CONCISE ENCYCLOPAEDIA OF WORLD RAILWAY LOCOMOTIVES. Edited by P. Ransome-Wallis. Hutchinson. 50s. [...] The work is a symposium by writers who are mostly specialists in the topics about which they write.
1960 January, “New reading on railways”, in Trains Illustrated, page 26