1727, from Latin auditorium "lecture room," literally "place where something is heard," neuter of auditorius (adj.) "of or for hearing," from auditus, past participle of audire "to hear" (see audience); also see -ory. Earlier in the same sense was auditory (late 14c.).
1. Men in green army uniforms are sprinkled throughout the huge auditorium.
2. The Albert Hall is a huge auditorium.
3. The teacher gathered all the pupils in the auditorium.
4. We'll have the meeting in the classroom rather than in the auditorium.
5. Who will undertake the job of decorating the auditorium?