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A thesaurus (pl.: thesauri or thesauruses), sometimes called a synonym dictionary or dictionary of synonyms, is a reference work which arranges words by their meanings (or in simpler terms, a book where one can find different words with similar meanings to other words), [1] [2] sometimes as a hierarchy of broader and narrower terms, sometimes simply as lists of synonyms and antonyms.
A thesaurus or synonym dictionary lists similar or related words; these are often, but not always, synonyms. [15] The word poecilonym is a rare synonym of the word synonym. It is not entered in most major dictionaries and is a curiosity or piece of trivia for being an autological word because of its meta quality as a synonym of synonym.
The thesaurus is integrated into the dictionary. Under each definition, various related words are shown, including: Synonyms; Antonyms; Hyponyms ('play' lists several subtypes of play, including 'passion play') Hypernyms ('daisy' is listed as a type of 'flower') Constituents (under 'forest', listed parts include 'tree' and 'underbrush')
In 1996, Merriam-Webster launched its first website, which provided free access to an online dictionary and thesaurus. [ 10 ] Merriam-Webster has also published dictionaries of synonyms , English usage , geography ( Merriam-Webster's Geographical Dictionary ), biography , proper names , medical terms , sports terms, slang , Spanish/English, and ...
Roget's Thesaurus is composed of six primary classes. [5] 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.
A thesaurus is composed by at least three elements: 1-a list of words (or terms), 2-the relationship amongst the words (or terms), indicated by their hierarchical relative position (e.g. parent/broader term; child/narrower term, synonym, etc.), 3-a set of rules on how to use the thesaurus.
WordNet is a lexical database of semantic relations between words that links words into semantic relations including synonyms, hyponyms, and meronyms. The synonyms are grouped into synsets with short definitions and usage examples. It can thus be seen as a combination and extension of a dictionary and thesaurus.
The application provides definitions and synonyms from various dictionaries, Wikipedia articles and a glossary of Apple-related terms. Dictionary was introduced in OS X 10.4 with the New Oxford American Dictionary and Oxford American Writer's Thesaurus (as well as the Wikipedia and Apple Dictionary sections).