the weight, in long tons, of a cargo vessel loaded so that the summer load line touches the surface of the water.
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British Dictionary definitions for load displacement
nautical the total weight of a cargo vessel loaded so that its waterline reaches the summer load line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012