1) Unloading charge for ships 
cargo carried by or fee for carrying cargo by lighter
Charge for conveying cargo by lighters or barges.
• (n.) The price paid for conveyance of goods on a lighter. • (n.) The act of unloading into a lighter, or of conveying by a lighter.
Light'er·age (-aj; 48) noun 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. 
Charge for conveying cargo by lighters or barges.
[n] - the fee charged for carrying goods in lighters 2. [n] - the transportation of goods on a lighter
The cost of loading or unloading a vessel by means of barges.
noun the transportation of goods on a lighter