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English definition of “auditorium”

auditorium

noun [C]     /ˌɔː.dɪˈtɔː.ri.əm/ US  /ˌɑː.dɪˈtɔːr.i-/ (plural auditoriums or auditoria   //   )
the part of a theatre, or similar building, where the people who are watching and listening sit: No smoking in the auditorium.Theatre auditorium and front-of-house mainly US a large public building where meetings, concerts, etc. are heldTheatre auditorium and front-of-housePublic entertainment venues
(Definition of auditorium noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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