Source : Webster's Revised Unabridged Dictionary (1913)

Lighterage \Light"er*age\ (-[asl]j; 48), n.
   1. The price paid for conveyance of goods on a lighter.

   2. The act of unloading into a lighter, or of conveying by a
      lighter.

Source : WordNet®

lighterage
     n 1: the fee charged for carrying goods in lighters
     2: the transportation of goods on a lighter