Synonyms of auditorium
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chamberA chamber is a large room, especially one that is used for formal meetings.
• We are going to be in the council chamber when he speaks.
hallA hall is a large room or building which is used for public events such as concerts, exhibitions, and meetings.
• We filed into the lecture hall.
• a well equipped library and the main lecture theatre
Thesaurus for auditorium from the Collins English Thesaurus
the area of a concert hall, theatre, school, etc, in which the audience sits