Source : Webster's Revised Unabridged Dictionary (1913)

Poundage \Pound"age\, n.
   1. A sum deducted from a pound, or a certain sum paid for
      each pound; a commission.

   2. A subsidy of twelve pence in the pound, formerly granted
      to the crown on all goods exported or imported, and if by
      aliens, more. [Eng.] --Blackstone.

   3. (Law) The sum allowed to a sheriff or other officer upon
      the amount realized by an execution; -- estimated in
      England, and formerly in the United States, at so much of
      the pound. --Burrill. Bouvier.

Poundage \Pound"age\, v. t.
   To collect, as poundage; to assess, or rate, by poundage.
   [R.]

Poundage \Pound"age\, n. [See 3d {Pound}.]
   1. Confinement of cattle, or other animals, in a public
      pound.

   2. A charge paid for the release of impounded cattle.

Source : WordNet®

poundage
     n 1: a charge based on weight measured in pounds
     2: a fee charged for the recovery of impounded animals
     3: weight expressed in pounds
     4: placing private property in the custody of an officer of the
        law [syn: {impoundment}, {impounding}, {internment}]