Source : Webster's Revised Unabridged Dictionary (1913)

Sixpence \Six"pence\, n.; pl. {Sixpences}.
   An English silver coin of the value of six pennies; half a
   shilling, or about twelve cents.

Source : WordNet®

sixpence
     n : a small coin of the United Kingdom worth six pennies; not
         minted since 1970 [syn: {tanner}]