Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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