/ ˌɔːdɪˈtɔːriəm; NAmE / noun ( pl. audi·tor·iums or audi·toria / -riə; NAmE /)
1.
the part of a theatre, concert hall, etc. in which the audience sits
2.
( NAmE ) a large building or room in which public meetings, concerts, etc. are held
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WORD ORIGIN
early 17th cent. (originally in the general sense a place for hearing ): from Latin , neuter of auditorius relating to hearing, from audire hear.