The Collaborative International Dictionary of English v.0.48:

Gibbon \Gib"bon\, n. [Cf. F. gibbon.] (Zool.)
   Any arboreal ape of the genus Hylobates, of which many
   species and varieties inhabit the East Indies and Southern
   Asia. They are tailless and without cheek pouches, and have
   very long arms, adapted for climbing.

   Note: The white-handed gibbon (Hylobates lar), the crowned
         (H. pilatus), the wou-wou or singing gibbon (H.
         agilis), the siamang, and the hoolock. are the most
         common species.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Gibbon
    n 1: English historian best known for his history of the Roman
         Empire (1737-1794) [syn: Gibbon, Edward Gibbon]
    2: smallest and most perfectly anthropoid arboreal ape having
       long arms and no tail; of southern Asia and East Indies [syn:
       gibbon, Hylobates lar]

U.S. Gazetteer Places (2000):

Gibbon, NE -- U.S. city in Nebraska
   Population (2000):    1759
   Housing Units (2000): 668
   Land area (2000):     0.838856 sq. miles (2.172628 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.838856 sq. miles (2.172628 sq. km)
   FIPS code:            18615
   Located within:       Nebraska (NE), FIPS 31
   Location:             40.747656 N, 98.844381 W
   ZIP Codes (1990):     68840
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gibbon, NE
    Gibbon


U.S. Gazetteer Places (2000):

Gibbon, MN -- U.S. city in Minnesota
   Population (2000):    808
   Housing Units (2000): 378
   Land area (2000):     0.887940 sq. miles (2.299753 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.887940 sq. miles (2.299753 sq. km)
   FIPS code:            23678
   Located within:       Minnesota (MN), FIPS 27
   Location:             44.533200 N, 94.524178 W
   ZIP Codes (1990):     55335
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gibbon, MN
    Gibbon