Roget's Thesaurus  

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Roget's Thesaurus is a widely-used English thesaurus, created by Dr. Peter Mark Roget (17791869) in 1805 and was released to the public on 29 April, 1852. The original edition had 15,000 words, and each new edition has been larger. The Karpeles Manuscript Library houses the original manuscript in its collection.

The name "Roget" is not trademarked. Use of the name "Roget" in the title of a thesaurus does not necessarily indicate any relationship to Dr. Roget or the original Roget's Thesaurus. It has come to be seen as a generic thesaurus name, like "Webster" for dictionaries.

Dr. Roget described his thesaurus in the foreword to the first edition:

"It is now nearly fifty years since I first projected a system of verbal classification similar to that on which the present work is founded. Conceiving that such a compilation might help to supply my own deficiencies, I had, in the year 1805, completed a classed catalogue of words on a small scale, but on the same principle, and nearly in the same form, as the Thesaurus now published."

Roget's Thesaurus is composed of six primary classes. Each class is composed of multiple divisions and then sections. This may be conceptualized as a tree containing over a thousand branches for individual "meaning clusters" or semantically linked words. These words are not exactly synonyms, but can be viewed as colours or connotations of a meaning or as a spectrum of a concept. One of the most general words is chosen to typify the spectrum as its headword, which labels the whole group.

Roget's Thesaurus can be seen as a classification system, as evidenced by the outline from the 1911 US edition, now in the public domain.

Roget's schema of classes and their subdivisions is based on the philosophical work of Leibniz (see Symbolic thought in Leibniz) - itself following a long tradition of epistemological work starting with Aristotle. Some of Aristotle's Categories are included in Roget's first class "abstract relations". The Wikipedia "category schemes" are also based on the same principles.

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Roget's Thesaurus" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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