Roget's International Thesaurus

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Fourth Edition - Complete & Unabridged Roget's International Thesaurus is the most comprehensive and useful thesaurus available today. It is a true thesaurus. It remains faithful to the original system of word association put forward by Dr. Peter Mark Roget in the 19th century - a concept that has proved so fundamental and valuable that it is being used in research to simulate human intelligence in computers. This Fourth Edition of Roget's International Thesaurus is: • Expanded and updated • Easy to use • Broader in scope • Time-tested format • Useful usage guidance