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Classification may refer to:

• Library classification and classification in general
• Taxonomic classification
• Optimal classification
• Scientific classification of organisms
• Scientific classification (disambiguation)
• Classification (literature)
• Statistical classification
• Document classification
• Security classification - sensitive information to which access is restricted by law or regulation to particular classes of people.
• Classification theorems in mathematics.
• Film classification
• CLASSIPHI, a seabed mapping tool supplied by QinetiQ
• Civil service classification, personnel grades in government
• Attribute-value system
• Ship classification

See also

• Class
• Categorization

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