auditorium
US /ˌɑː.dəˈtɔːr.i.əm/
UK /ˌɑː.dəˈtɔːr.i.əm/
1.
the part of a theater, concert hall, or other public building in which the audience sits.
:
•
The school's new auditorium can seat over 500 people.
•
The play will be performed in the main auditorium.