Source : Webster's Revised Unabridged Dictionary (1913)

Portage \Port"age\ (?; 48), n. [From 2d {Port}.] (Naut.)
   (a) A sailor's wages when in port.
   (b) The amount of a sailor's wages for a voyage.

Portage \Port"age\, n. [3d {Port}.]
   A porthole. [Obs.] --Shak.

Portage \Por"tage\, n. [F., from porter to carry. See {Port} to
   carry.]
   1. The act of carrying or transporting.

   2. The price of carriage; porterage. --Bp. Fell.

   3. Capacity for carrying; tonnage. [Obs.] --Hakluyt.

   4. A carry between navigable waters. See 3d {Carry}.

Portage \Por"tage\, v. t. & i.
   To carry (goods, boats, etc.) overland between navigable
   waters.

Source : WordNet®

portage
     n 1: the cost of carrying or transporting
     2: overland track between navigable waterways
     3: carrying boats and supplies overland