The Collaborative International Dictionary of English v.0.48:

Ilion \Ilion\ prop. n.
   Ilium, or Troy, the ancient city in Asia Minor that was the
   site of the Trojan War; -- a variant spelling of Ilium.

   Syn: Troy, Ilium.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Ilium \Il"i*um\, n. [See Ileum.] (Anat.)
   The dorsal one of the three principal bones comprising either
   lateral half of the pelvis; the dorsal or upper part of the
   hip bone. See Innominate bone, under Innominate. [Written
   also ilion, and ileum.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

Ilion
    n 1: an ancient city in Asia Minor that was the site of the
         Trojan War [syn: Troy, Ilion, Ilium]

U.S. Gazetteer Places (2000):

Ilion, NY -- U.S. village in New York
   Population (2000):    8610
   Housing Units (2000): 3623
   Land area (2000):     2.476579 sq. miles (6.414309 sq. km)
   Water area (2000):    0.045544 sq. miles (0.117959 sq. km)
   Total area (2000):    2.522123 sq. miles (6.532268 sq. km)
   FIPS code:            37275
   Located within:       New York (NY), FIPS 36
   Location:             43.013408 N, 75.043633 W
   ZIP Codes (1990):     13357
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Ilion, NY
    Ilion