Roget's Thesaurus is a widely used English-language thesaurus, created in 1805 by Peter Mark Roget, British physician, natural theologian and lexicographer. It was released to the public on 29 April 1852. The original edition had 15,000 words, and each new edition has been larger.
This edition of Roget's Thesaurus preserves the plan of classification and categories, including the index, but has been completely revised and updated. Over 10,000 more words and phrases have been added including a representation of today's technical terms, Americanisms and slang.
