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A thesaurus is a controlled vocabulary tool used for organizing, indexing, storing, and retrieving information effectively. In Information Processing and Retrieval, a thesaurus provides a structured set of terms representing concepts in a particular subject field and indicates the relationships among those terms. Unlike an ordinary dictionary, which mainly explains meanings and usage of words, an information retrieval thesaurus is concerned with controlling terminology so that the same concept can be represented consistently during indexing and searching. It helps users and information professionals overcome problems caused by synonyms, homonyms, variant spellings, and differences in terminology. A thesaurus generally contains preferred terms, non-preferred terms, broader terms, narrower terms, and related terms. A preferred term is the authorized term selected for indexing and retrieval. A non-preferred term is an alternative or synonymous term that directs the user to the preferred term. Broader terms represent more ____ ________ ________ ___ ______ __________ _________ ____ _________ ______.
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