| classification system | | |
| n. (cognition) | 1. classification system | a system for classifying things. |
| ~ organization, arrangement, organisation, system | an organized structure for arranging or classifying.; "he changed the arrangement of the topics"; "the facts were familiar but it was in the organization of them that he was original"; "he tried to understand their system of classification" |
| ~ decimal system of classification, dewey decimal classification, dewey decimal system | 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. |
| ~ hierarchical classification system | a classification system where entries are arranged based on some hierarchical structure. |
| ~ file system, filing system | a system of classifying into files (usually arranged alphabetically). |
| ~ pigeonholing, grouping | a system for classifying things into groups. |
| ~ rating system, scoring system | a system of classifying according to quality or merit or amount. |
| ~ 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. |
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