D defs.my
Entry 2 senses Webster, 1913

Auditorium

/ôdˌ-ət-ôr'-ē-əm/ · Au·di·to·ri·um · IPA /ˌɔ.dɪˌto.ɹi.əm/
01 n. The part of a church, theater, or other public building, assigned to the audience.
  1. 1.
    The part of a church, theater, or other public building, assigned to the audience.
  2. 2.
    a building, or a room within a building, containing a large open space for public gatherings, and often having a raised stage where speakers or presentations may be easily viewed by the audience.