an assessed percentage deduction, as in weight or price, granted in dealings with goods that are likely to shrink, leak, or otherwise vary in the amount or weight originally stated.
the amount of lumber estimated to be contained in a log being scaled.
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British Dictionary definitions for scalage
US a percentage deducted from the price of goods liable to shrink or leak
forestry, US and Canadian the estimated amount of usable timber in a log
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