N auditorium adj relating to a hearer or hearing auditoriumu`di*tori*um (&?;), n. [l. see auditory, n.] the part of a church, theater, or other public building, assigned to the audience.note: in ancient churches the auditorium was the nave, where hearers stood to be instructed; in monasteries it was an apartment for the reception of strangers. (n.) The part of a church, theater, or other public