The Collaborative International Dictionary of English v.0.48:

Tiffin \Tif"fin\, n. [Properly, tiffing a quaffing, a drinking.
   See Tiff, n.]
   A lunch, or slight repast between breakfast and dinner; --
   originally, a Provincial English word, but introduced into
   India, and brought back to England in a special sense.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tiffin
    n 1: a midday meal [syn: lunch, luncheon, tiffin,
         dejeuner]

U.S. Gazetteer Places (2000):

Tiffin, OH -- U.S. city in Ohio
   Population (2000):    18135
   Housing Units (2000): 7862
   Land area (2000):     6.494442 sq. miles (16.820526 sq. km)
   Water area (2000):    0.141731 sq. miles (0.367082 sq. km)
   Total area (2000):    6.636173 sq. miles (17.187608 sq. km)
   FIPS code:            76778
   Located within:       Ohio (OH), FIPS 39
   Location:             41.116834 N, 83.179003 W
   ZIP Codes (1990):     44883
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Tiffin, OH
    Tiffin


U.S. Gazetteer Places (2000):

Tiffin, IA -- U.S. city in Iowa
   Population (2000):    975
   Housing Units (2000): 457
   Land area (2000):     2.989005 sq. miles (7.741486 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    2.989005 sq. miles (7.741486 sq. km)
   FIPS code:            78060
   Located within:       Iowa (IA), FIPS 19
   Location:             41.706432 N, 91.661471 W
   ZIP Codes (1990):
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Tiffin, IA
    Tiffin