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Thesaurus

A compilation of terms showing synonymous, hierarchical, and other relationships and dependencies, the function of which is to provide a standardized, controlled vocabulary for information storage and retrieval. Its component parts are an index vocabulary and a lead-in vocabulary. While the best known thesaurus is Roget's Thesaurus of English Words and Phrases, a number of databases also have thesauri. The ERIC thesaurus, the CAB thesaurus, and the Library of Congress Subject Headings are examples of these. These lists of pre-defined, controlled vocabulary can be very helpful when searching databases which use thesauri. (See also Library of Congress subject headings, subject headings)


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