Wikipedia
Bouleuterion
A bouleuterion (, bouleutērion), also translated as and was a building in ancient Greece which housed the council of citizens (, boulē) of a democratic city state. These representatives assembled at the bouleteurion to confer and decide about public affairs. There are several extant bouleuteria around Greece and its former colonies. It should not be confused with the Prytaneion, which housed the executive council of the assembly and often served as the boule's mess hall.
Usage examples of "bouleuterion".
I trudged back down to the bouleuterion where the aldermen of Delphi held their meetings.