The Collaborative International Dictionary of English v.0.48:

Saint Nicholas \Saint Nicholas\, St Nicholas \St. Nicholas\, n.
   A Dutch saint, who was reputed to bring gifts to children on
   Christmas even, giving rise to the modern legend of Santa
   Claus.
   [PJC]

   A Visit from St. Nicholas The original name for a poem by
      Clement Clarke Moore, popularly called titled The Night
      Before Christmans. It is a popular poem with the theme of
      St. Nicholas (Santa Claus) coming to bring gifts to
      children on Christmans eve. See Night Before Christmas
      in the vocabulary.
      [PJC]

WordNet (r) 3.0 (2006):

Santa Claus
    n 1: the legendary patron saint of children; an imaginary being
         who is thought to bring presents to children at Christmas
         [syn: Santa Claus, Santa, Kriss Kringle, Father
         Christmas, Saint Nicholas, Saint Nick, St. Nick]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "Santa Claus":
   Father Christmas, Kriss Kringle, Maecenas, Saint Nicholas,
   Saint Nick, Santa, almoner, almsgiver, angel, assignor, awarder,
   backer, bestower, cheerful giver, conferrer, consignor,
   contributor, donator, donor, fairy godmother, feoffor, financer,
   funder, giver, grantor, imparter, lady bountiful, patron,
   patroness, philanthropist, presenter, settler, subscriber,
   sugar daddy, supporter, testate, testator, testatrix, vouchsafer



U.S. Gazetteer Places (2000):

Santa Claus, GA -- U.S. city in Georgia
   Population (2000):    237
   Housing Units (2000): 89
   Land area (2000):     0.182698 sq. miles (0.473186 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.182698 sq. miles (0.473186 sq. km)
   FIPS code:            68600
   Located within:       Georgia (GA), FIPS 13
   Location:             32.170863 N, 82.331129 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Santa Claus, GA
    Santa Claus


U.S. Gazetteer Places (2000):

Santa Claus, IN -- U.S. town in Indiana
   Population (2000):    2041
   Housing Units (2000): 818
   Land area (2000):     5.182788 sq. miles (13.423359 sq. km)
   Water area (2000):    0.384430 sq. miles (0.995670 sq. km)
   Total area (2000):    5.567218 sq. miles (14.419029 sq. km)
   FIPS code:            68022
   Located within:       Indiana (IN), FIPS 18
   Location:             38.118870 N, 86.921422 W
   ZIP Codes (1990):     47579
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Santa Claus, IN
    Santa Claus