The Collaborative International Dictionary of English v.0.48:

Dormitory \Dor"mi*to*ry\, n.; pl. Dormitories. [L.
   dormitorium, fr. dormitorius of or for sleeping, fr. dormire
   to sleep. See Dormant.]
   1. A sleeping room, or a building containing a series of
      sleeping rooms; a sleeping apartment capable of containing
      many beds; esp., one connected with a college or boarding
      school. --Thackeray.
      [1913 Webster]

   2. A burial place. [Obs.] --Ayliffe.
      [1913 Webster]

            My sister was interred in a very honorable manner in
            our dormitory, joining to the parish church.
                                                  --Evelyn.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dormitory
    n 1: a college or university building containing living quarters
         for students [syn: dormitory, dorm, residence hall,
         hall, student residence]
    2: a large sleeping room containing several beds [syn:
       dormitory, dormitory room, dorm room]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "dormitory":
   bedchamber, bedroom, boardinghouse, boudoir, chamber, cubicle,
   cubiculum, dorm, doss house, fleabag, flophouse, guest house,
   hospice, hostel, hostelry, hotel, inn, lodging house, nursery,
   ordinary, pension, posada, pub, public, public house, roadhouse,
   rooming house, sleeping room, tavern