the act of classifying.
the result of classifying or being classified.
one of the groups or classes into which things may be or have been classified.
Biology. the assignment of organisms to groups within a system of categories distinguished by structure, origin, etc. The usual series of categories is phylum (or, especially in botany, division ), class, order, family, genus, species, and variety. See table under taxonomy.
the category, as restricted, confidential, secret, or top secret, to which information, a document, etc., is assigned, as by a government or military agency, based on the degree of protection considered necessary to safeguard it from unauthorized use.
Library Science. any of various systems for arranging books and other materials, especially according to subject or format.

1780–90; < Latin classi(s) class + -fication

classificatory [kluh-sif-i-kuh-tawr-ee, -tohr-ee, klas-uh-fi- or, esp. British, klas-uh-fi-key-tuh-ree] , adjective
clasificatorily, adverb
classificational, adjective
misclassification, noun
nonclassification, noun
overclassification, noun
preclassification, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
classification (ˌklæsɪfɪˈkeɪʃən)
1.  systematic placement in categories
2.  one of the divisions in a system of classifying
3.  biology
 a.  the placing of animals and plants in a series of increasingly specialized groups because of similarities in structure, origin, molecular composition, etc, that indicate a common relationship. The major groups are domain or superkingdom, kingdom, phylum (in animals) or division (in plants), class, order, family, genus, and species
 b.  the study of the principles and practice of this process; taxonomy
4.  government the designation of an item of information as being secret and not available to people outside a restricted group
[C18: from French; see class, -ify, -ation]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

classification clas·si·fi·ca·tion (klās'ə-fĭ-kā'shən)

  1. A systematic arrangement into classes or groups.

  2. The systematic grouping of organisms into categories on the basis of evolutionary or structural relationships between them; taxonomy.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
classification  [%PREMIUM_LINK%]     (klās'ə-fĭ-kā'shən)  Pronunciation Key 
The systematic grouping of organisms according to the structural or evolutionary relationships among them. Organisms are normally classified by observed similarities in their body and cell structure or by evolutionary relationships based on the analysis of sequences of their DNA. See more at cladistics, Linnean. See Table at taxonomy.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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