Source : Webster's Revised Unabridged Dictionary (1913)

Teaspoon \Tea"spoon`\ (t[=e]"sp[=oo]n`), n.
   A small spoon used in stirring and sipping tea, coffee, etc.,
   and for other purposes.

Source : WordNet®

teaspoon
     n 1: a small spoon used for stirring tea or coffee; holds about
          one fluid dram
     2: as much as a teaspoon will hold [syn: {teaspoonful}]