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Dewey decimal classification, Dewey decimal system, decimal system of classification
a system used by libraries to classify nonfictional publications into subject categories; the subject is indicated by a three-digit numeral and further specification is given by numerals following a decimal point; publications are shelved by number
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hierarchical classification system
a classification system where entries are arranged based on some hierarchical structure
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file system, filing system
a system of classifying into files (usually arranged alphabetically)
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grouping, pigeonholing
a system for classifying things into groups
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rating system, scoring system
a system of classifying according to quality or merit or amount
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ABO blood group system, ABO group, ABO system
a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O
