dormitory

Concise Oxford English Dictionary © 2008 Oxford University Press:
dormitory /ˈdɔːmɪt(ə)ri/

▶noun (pl. dormitories)

• 1 a bedroom for a number of people in a school or other institution.

  ■ N. Amer. a college hall of residence.

• 2 [as modifier] denoting a small town or suburb from which people travel to work in a nearby city.

– origin ME: from L. dormitorium, neut. (used as n.) of dormitorius, from dormire ‘to sleep’.