[klas-uh-fi-key-shuh
n] 
| 1. | the act of classifying. |
| 2. | the result of classifying or being classified. |
| 3. | one of the groups or classes into which things may be or have been classified. |
| 4. | 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, esp. in botany, division), class, order, family, genus, species, and variety. |
| 5. | 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. |
| 6. | Library Science. any of various systems for arranging books and other materials, esp. according to subject or format. |
classification clas·si·fi·ca·tion (klās'ə-fĭ-kā'shən)
n.
A systematic arrangement into classes or groups.
The systematic grouping of organisms into categories on the basis of evolutionary or structural relationships between them; taxonomy.