The Collaborative International Dictionary of English v.0.48:

Plaza \Pla"za\, n. [Sp. See Place.]
   A public square in a city or town.
   [1913 Webster]

WordNet (r) 3.0 (2006):

plaza
    n 1: a public square with room for pedestrians; "they met at Elm
         Plaza"; "Grosvenor Place" [syn: plaza, place, piazza]
    2: mercantile establishment consisting of a carefully landscaped
       complex of shops representing leading merchandisers; usually
       includes restaurants and a convenient parking area; a modern
       version of the traditional marketplace; "a good plaza should
       have a movie house"; "they spent their weekends at the local
       malls" [syn: plaza, mall, center, shopping mall,
       shopping center, shopping centre]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "plaza":
   agora, auto show, bazaar, boat show, campo, commercial complex,
   emporium, exposition, fair, flea fair, flea market, forum, green,
   market, market cross, market overt, marketplace, mart, open market,
   piazza, place, rialto, shopping center, shopping mall,
   shopping plaza, show, square, staple, street market, trade fair



U.S. Gazetteer Places (2000):

Plaza, ND -- U.S. city in North Dakota
   Population (2000):    167
   Housing Units (2000): 115
   Land area (2000):     1.122876 sq. miles (2.908236 sq. km)
   Water area (2000):    0.012702 sq. miles (0.032897 sq. km)
   Total area (2000):    1.135578 sq. miles (2.941133 sq. km)
   FIPS code:            62980
   Located within:       North Dakota (ND), FIPS 38
   Location:             48.024807 N, 101.960556 W
   ZIP Codes (1990):     58771
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Plaza, ND
    Plaza