The Collaborative International Dictionary of English v.0.48:

Lynch \Lynch\, v. t. [imp. & p. p. Lynched; p. pr. & vb. n.
   Lynching.] [See Note under Lynch law.]
   To inflict punishment upon, especially death, without the
   forms of law, as when a mob captures and hangs a suspected
   person. See Lynch law.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lynch
    v 1: kill without legal sanction; "The blood-thirsty mob lynched
         the alleged killer of the child"

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "lynch":
   and quarter, annihilate, bereave of life, carry away, carry off,
   chloroform, cut down, cut off, deprive of life, destroy, dispatch,
   dispose of, do away with, do for, do to death, draw, end, execute,
   exterminate, finish, finish off, gibbet, hang, immolate, kill,
   launch into eternity, liquidate, make away with, martyr, martyrize,
   neck, noose, poison, purge, put away, put down, put to death,
   put to sleep, remove from life, sacrifice, scrag, slay, starve,
   stretch, string up, take life, take off



U.S. Gazetteer Places (2000):

Lynch, NE -- U.S. village in Nebraska
   Population (2000):    269
   Housing Units (2000): 177
   Land area (2000):     0.564906 sq. miles (1.463100 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.564906 sq. miles (1.463100 sq. km)
   FIPS code:            29750
   Located within:       Nebraska (NE), FIPS 31
   Location:             42.829804 N, 98.465453 W
   ZIP Codes (1990):     68746
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Lynch, NE
    Lynch


U.S. Gazetteer Places (2000):

Lynch, KY -- U.S. city in Kentucky
   Population (2000):    900
   Housing Units (2000): 514
   Land area (2000):     0.326903 sq. miles (0.846674 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.326903 sq. miles (0.846674 sq. km)
   FIPS code:            48540
   Located within:       Kentucky (KY), FIPS 21
   Location:             36.965133 N, 82.916569 W
   ZIP Codes (1990):     40855
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Lynch, KY
    Lynch