au·di·to·ri·um /ˌɔdəˈtoriəm, ˈtɔr-/
1. The part of a church, theater, or other public building, assigned to the audience.
Note: ☞ In ancient churches the auditorium was the nave, where hearers stood to be instructed; in monasteries it was an apartment for the reception of strangers.
n : the area of a theater or concert hall where the audience
[also: auditoria (pl)]