The Collaborative International Dictionary of English v.0.48:

Campus \Cam"pus\, n. [L., a field.]
   1. The principal grounds of a college or school, between the
      buildings or within the main inclosure; as, the college
      campus.
      [1913 Webster]

   2. a college or university.
      [PJC]

   3. a division of a university with its own buildings and a
      separate faculty, especially one separated geographically
      from other divisiona, but sharing top administration with
      other units of the university; as, the Newark campus of
      Rutgers.
      [PJC]

   4. higher education considered as a whole; as, the financial
      effects of research cutbacks on the campus.
      [PJC]

   5. a business site with pleasant landscaping; as, the Squibb
      research campus at Princeton.
      [PJC]

WordNet (r) 3.0 (2006):

campus
    n 1: a field on which the buildings of a university are situated

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "campus":
   agora, amphitheater, arena, athletic field, auditorium, background,
   bear garden, bowl, boxing ring, bull ring, canvas, circus,
   classroom building, cockpit, coliseum, colosseum, course, field,
   floor, forum, ground, gym, gymnasium, hall, hippodrome, lists,
   little red schoolhouse, locale, marketplace, mat, milieu,
   open forum, palaestra, parade ground, pit, place, platform,
   precinct, prize ring, public square, purlieu, range, ring, scene,
   scene of action, scenery, school building, schoolhouse, setting,
   site, sphere, squared circle, stadium, stage, stage set,
   stage setting, terrain, theater, tilting ground, tiltyard, walk,
   wrestling ring



U.S. Gazetteer Places (2000):

Campus, IL -- U.S. village in Illinois
   Population (2000):    145
   Housing Units (2000): 45
   Land area (2000):     0.099373 sq. miles (0.257376 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.099373 sq. miles (0.257376 sq. km)
   FIPS code:            10916
   Located within:       Illinois (IL), FIPS 17
   Location:             41.023691 N, 88.306503 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Campus, IL
    Campus