Source : Webster's Revised Unabridged Dictionary (1913)

Tablespoon \Ta"ble*spoon`\, n.
   A spoon of the largest size commonly used at the table; --
   distinguished from teaspoon, dessert spoon, etc.

Source : WordNet®

tablespoon
     n 1: as much as a tablespoon will hold [syn: {tablespoonful}]
     2: a spoon larger than a dessert spoon; used for serving