au·di·to·ri·um
 /ˌɑːdəˈtorijəm/  noun  ,  pl   -to·ri·ums  also   -to·ria /-ˈtorijə/ [  count  ]
  1 US : a large room or building where people gather to watch a performance, hear a speech, etc.
  2 : the part of a building (such as a theater) where an audience sits