Source : Webster's Revised Unabridged Dictionary (1913)

Lastage \Last"age\n. [E. lestage ballasting, fr. lest ballast,
   or LL. lastagium, lestagium. See {Last} a load.]
   1. A duty exacted, in some fairs or markets, for the right to
      carry things where one will. [Obs.]

   2. A tax on wares sold by the last. [Obs.] --Cowell.

   3. The lading of a ship; also, ballast. --Spelman.

   4. Room for stowing goods, as in a ship.