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angle of repose

noun, Geology
the maximum slope, measured in degrees from the horizontal, at which loose solid material will remain in place without sliding.
Compare angle of slide.
Origin of angle of repose
1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for angle-of-repose

angle of repose

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