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Language reference book organized to help in finding words related to a core concept but having different shades of meaning (connotations). Unlike a dictionary (which is organized to help in finding the meaning if you know the word), a thesaurus requires you to know the intended meaning to help find the correct word. Unlike a dictionary of synonyms (which is an alphabetical list of related words) a thesaurus is structured around ideas, and serves as a treasury of knowledge. First English language thesaurus (the 'Roget's Thesaurus') was created in 1852 by the UK surgeon Dr. Peter Mark Roget (1779-1869).
The term is derived from the Greek word 'thesauros,' treasure.

Use 'thesaurus' in a Sentence

The teacher noticed that her student had used the same word many times in his essay, so she suggested using a thesaurus to find another word with a similar meaning.
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Political speechwriters often utilize a thesaurus to convey the meaning of a particular idea in multiple ways and to shape how the public and the press view various policy platforms.
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When the children do not know what word to use their teacher tells them to use the thesaurus, which also helps expand their vocabulary.
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