The Collaborative International Dictionary of English v.0.48:

Rodeo \Ro*de"o\, n. [SP., a going round.]
   A round-up. See Round-up. [Western U.S.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

rodeo
    n 1: an exhibition of cowboy skills
    2: an enclosure for cattle that have been rounded up

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "rodeo":
   assemblage, assembly, burlesque show, call-up, canvass, carnival,
   census, circus, collection, colligation, collocation, combination,
   comparison, concourse, concurrence, confluence, conflux,
   congregation, convergence, coochie show, corralling,
   data-gathering, fantoccini, floor show, galanty show, gathering,
   girly show, hootchy-kootchy show, ingathering, inventory, junction,
   juxtaposition, leg show, light show, magic show, mobilization,
   muster, ombres chinoises, peep show, puppet show, raree-show,
   rep show, repertory show, roundup, shadow show, sideshow, survey,
   the big top, variety show, vaudeville show



U.S. Gazetteer Places (2000):

Rodeo, CA -- U.S. Census Designated Place in California
   Population (2000):    8717
   Housing Units (2000): 2984
   Land area (2000):     7.366418 sq. miles (19.078935 sq. km)
   Water area (2000):    0.003074 sq. miles (0.007961 sq. km)
   Total area (2000):    7.369492 sq. miles (19.086896 sq. km)
   FIPS code:            62490
   Located within:       California (CA), FIPS 06
   Location:             38.031271 N, 122.262139 W
   ZIP Codes (1990):     94572
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Rodeo, CA
    Rodeo