The Collaborative International Dictionary of English v.0.48:

Gettysburg \Gettysburg\ prop. n.
   The name of a battle of the American Civil War fought in and
   around the town of Gettysburg, Pennsylavania, in 1863. At
   this battle, the defeat of General Robert E. Lee's invading
   Confederate army was a major victory for the Union, and is
   considered by many a turning point in the war, after which
   victory by the Confederacy was no longer thought possible;
   as, many thousands died at Gettysburg. See also Gettysburg
   Address.

   Syn: battle of Gettysburg.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Gettysburg
    n 1: a small town in southern Pennsylvania; site of a national
         cemetery
    2: a battle of the American Civil War (1863); the defeat of
       Robert E. Lee's invading Confederate Army was a major victory
       for the Union [syn: Gettysburg, Battle of Gettysburg]

U.S. Gazetteer Places (2000):

Gettysburg, OH -- U.S. village in Ohio
   Population (2000):    558
   Housing Units (2000): 201
   Land area (2000):     0.440166 sq. miles (1.140025 sq. km)
   Water area (2000):    0.000407 sq. miles (0.001054 sq. km)
   Total area (2000):    0.440573 sq. miles (1.141079 sq. km)
   FIPS code:            29974
   Located within:       Ohio (OH), FIPS 39
   Location:             40.113609 N, 84.493188 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gettysburg, OH
    Gettysburg


U.S. Gazetteer Places (2000):

Gettysburg, PA -- U.S. borough in Pennsylvania
   Population (2000):    7490
   Housing Units (2000): 2759
   Land area (2000):     1.641704 sq. miles (4.251993 sq. km)
   Water area (2000):    0.004723 sq. miles (0.012232 sq. km)
   Total area (2000):    1.646427 sq. miles (4.264225 sq. km)
   FIPS code:            28960
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             39.829290 N, 77.234218 W
   ZIP Codes (1990):     17325
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gettysburg, PA
    Gettysburg


U.S. Gazetteer Places (2000):

Gettysburg, SD -- U.S. city in South Dakota
   Population (2000):    1352
   Housing Units (2000): 683
   Land area (2000):     1.864513 sq. miles (4.829066 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.864513 sq. miles (4.829066 sq. km)
   FIPS code:            24260
   Located within:       South Dakota (SD), FIPS 46
   Location:             45.011819 N, 99.955386 W
   ZIP Codes (1990):     57442
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Gettysburg, SD
    Gettysburg