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Dewey decimal classification

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Trademark.
  1. a system of classifying books and other works into ten main classes of knowledge with further subdivision in these classes by use of the numbers of a decimal system: devised by Melvil Dewey, published in 1876, and used in many libraries in the U.S. and elsewhere.
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Origin of Dewey decimal classification

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018