Black's Law Dictionary (2nd edition)dictionaries

Tonnage

GE. The capaclty of a vessel for carrylng freight or other, loads, calcu-lated in tons. But the way of estimating the tonnage varles iu dlfferent countries. In England, tonnage denotes the actual weight in tons which the vessel can safely carry; In America, her carrying capacity estimated from the cubic dimensions of the hold, bee Roberts v. Opdyke, 40 N. V. 259

Source: Black's Law Dictionary 2nd Ed (1910)