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A '''thesaurus''' is a [[dictionary]] that lists words that have a similar semantical meaning to the listed word.  The first published thesaurus was ''Roget's''<ref>http://www.beyondbooks.com/law81/1j.asp</ref>.

A '''thesaurus''' lists synonyms and antonyms of index words.  Most thesauruses (or thesauri) list index words alphabetically like a [[dictionary]]. Peter Mark Roget published the first thesaurus, ''Thesaurus of English Words and Phrases'' in the 1850's, and current editions have become known simply as ''Roget's'' or ''Roget's Thesaurus'' <ref>http://www.beyondbooks.com/law81/1j.asp</ref>.

==References==

==References==