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Functions of a Thesaurus
The major functions of a thesaurus include the following :
a) it provides a standard vocabulary for a given subject field by exercising control on the vocabulary of terms used in an indexing language. Methods of controlling the vocabulary are:
b) it shows the intrinsic, semantic relationship existing between, terms, and thus provides system of references between terms;
c) it helps the indexer and the searcher in the choice of preferred terms;
d) it provides hierarchical display of terms so that a search can be broadened or narrowed systematically;
e) it increases the speed of retrieval by use of indexing terms and search terms; and
f) it provides a map of a 'given subject field, which helps to understand the structure of the field.
Special or Subject Encyclopaedias There used to be a limited number of subject encyclopaedias in 19th century, but now, there is encyclopaedias for almost every subject. Mode
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