An Etymological Dictionary of Astronomy and Astrophysics

1. An informal meeting for the exchange of views.
   
2. A usually academic seminar on a broad field of study, usually led by a different lecturer at each meeting.

Etymology (EN): From L. colloquium “conference, conversation,” from → com- “together” + loqui “to speak”.

Etymology (PE): From Lori hacâyé “conversation among two or more people,” maybe from Av. ušyāi- “to speak, talk,” from vak- “to speak,” Skt. vacas “speech, word,” cognate with L. vox “voice,” vocare “to call,” Gk. ops “voice,” epos “song;” PIE root *wek- “to speak”.