Noah Webster's Dictionary (n.) The part of a church, theater, or other public building, assigned to the audience.

Multi-Version Concordance Auditorium (1 Occurrence) Acts 25:23 on the morrow, therefore -- on the coming of Agrippa and Bernice with much display, and they having entered into the audience chamber, with the chief captains also, and the principal men of the city, and Festus having ordered -- Paul was brought forth. (See NAS)