auditorium
n.-
1 a large hall (n.) B2 Upper Intermediatea large room or building where people gather to watch a performance or listen to a speech.
a large room or building designed for public meetings, concerts, or theatrical performances.
ExampleThe school held the graduation ceremony in the new auditorium because it had enough seats for everyone.
ExampleThe university's main auditorium was equipped with state-of-the-art acoustics to accommodate both academic lectures and professional orchestral performances.
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2 the seating area (n.) C1 Advanced Technical Theatrethe specific part of a theatre or hall where the audience sits.
the part of a theatre, concert hall, or other public building in which the audience sits, as distinct from the stage.
ExampleThe lights in the auditorium went dark just before the play started.
ExampleWhile the stage was cluttered with props, the auditorium remained pristine, with every velvet seat assigned to a donor for the opening night gala.
Borrowed from Latin audītōrium, from audītōrius (“pertaining to hearing”). Equivalent to auditory + -ium.