βουλευτήριον
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
English (LSJ)
τό,
A council-chamber, seat of a βουλή, Hdt.1.170, A.Eu.570,684, E.Andr.1097, And.1.36, D.18.169, Pl.Grg.452e, Michel1203 (Iasos), etc.; = Lat. curia, Plu.Cic.31, Hdn.5.5.7. II Council, Senate, D.H.2.12; of local βουλαί, PLond. 2.408.14 (iv A. D.), etc.; of individuals, δόλια βουλευτήρια treacherous counsellor, E.Andr.446; ῥυσὰ β. Theopomp. Com. 75 (paratrag.).
German (Pape)
[Seite 457] τό, Rathhaus, Aesch. δικαστῶν Eum. 684; Eur. Andr. 1097; Her. 8, 148; Plat. Gorg. 452 e u. öfter, wie Folgde, z. B. Andoc. 1, 95; Plut. Thes. 24; Rathsversammlung D. Hal. 2, 12; Rathgeber Eur. Andr. 446.