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angle of repose

noun Geology.
  1. the maximum slope, measured in degrees from the horizontal, at which loose solid material will remain in place without sliding.
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Origin of angle of repose

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for angle of repose

angle of repose

noun
  1. the maximum angle to the horizontal at which rocks, soil, etc, will remain without sliding
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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