a noun denoting something immaterial and abstract, as rest, dread, or transportation.
a noun formed with a suffix that imparts such a meaning, as kindness.
Compare concrete noun.
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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