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Dewey decimal system, the
     
Dewey decimal system, the also the Dewey Decimal Classification
a system used by libraries for putting books into groups according to their subject. General subjects (for example, sports) are given a number, and then particular parts of this subject (for example, the Olympics) are each given a more specific number using decimal numbers. The system was invented by Melvil Dewey (1851-1931), a US librarian.
Definition from the Longman Dictionary of Contemporary English
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