This definition emphasizes a priori relationships, which are document independent. The Unesco has defined the thesaurus as, ‘a vocabulary of controlled indexing language formally organized so that the a priori relationships between concepts (e.g., ‘broader’ and `narrower’) are made explicit’ (Unesco, 1981a). The Webster’s dictionary has defined it as, ‘a useful literary collection or selection especially a book of synonyms and antonyms.’ (Webster, 1987). Derivationally the word thesaurus originated from the Greek language and symbolized the concept of treasury or storehouse of knowledge.
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