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Definition
There are a number of definitions of 'thesaurus' provided by different experts and organisations. The most comprehensive one has been provided by the International Standards Organisation (ISO) as the basis of structure and functions of a thesaurus. In terms of functions, it states "a thesaurus is a terminological control device used in translating from the natural language of documents, indexers or users into a more constrained 'system language' (documentation language, information language)". In terms of structure, the Standard says, "a thesaurus is a controlled and dynamic vocabulary of semantically and generically related terms which covers a specific domain of knowledge".
In short, a thesaurus may be defined as a compilation of descriptors for use in an information retrieval system arranged in an alphabetical order and manifesting the various types of relationships existing between the descriptors. An information retrieval thesaurus is a kind of semantic networking of concepts.
Reference Entries In a Library where a Dictionary Catalogue is maintained we see entries of the type known as 'References' and also of the type known as 'Analytical Entries'.
Arrangement The articles of the encyclopaedias are arranged either in alphabetical or classified order depending upon the nature and size of articles and the editors plan for
Authority The authority of a dictionary can be determined by the reputation of its compiler(s)/editor(s), associates and publishers. Generally, a linguist et a philologist he
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Entry Vocabulary and Index Vocabulary Terms linked by equivalence relationships are rather different from those in the other two groups (hierarchical and associative relation
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