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A thesaurus (plural ''thesauri'' or ''thesauruses'') or synonym dictionary is a reference work for finding synonyms and sometimes antonyms of words. They are often used by writers to help find the best word to express an idea:
Synonym dictionaries have a long history. The word 'thesaurus' was used in 1852 by Peter Mark Roget for his ''Roget's Thesaurus''.
While some thesauri, such as ''Roget's Thesaurus'', group words in a hierarchy, hierarchical hypernym, hypernymic taxonomy (general), taxonomy of concepts, others are organized alphabetically or in some other way.
Most thesauri do not include definitions, but many dictionaries include listings of synonyms.
Some thesauri and dictionary synonym notes characterize the distinctions between similar words, with notes on their "connotations and varying shades of meaning".''American Heritage Dictionary of the English Language'', 5th edition, Houghton Mifflin Harcourt 2011, , p. xxvii Some synonym dictionaries are primarily concerned with differentiating synonyms by meaning and usage. Usage dictionary, Usage manuals such as Fowler's ''A Dictionary of Modern English Usage, Dictionary of Modern English Usage'' often Linguistic prescription, prescribe appropriate usage of synonyms.
Writers sometimes use thesauri to avoid repetition of words — elegant variation — which is often criticized by usage manuals: "writers sometimes use them not just to vary their vocabularies but to dress them up too much".
''Online Etymology Dictionary''. The word ''thēsauros'' is of uncertain etymology.''Oxford English Dictionary'
''s.v.''
/ref> Until the 19th century, a thesaurus was any dictionary or encyclopedia, as in the ''Thesaurus Linguae Latinae'' (''Dictionary of the Latin Language'', 1532), and the ''Thesaurus Linguae Graecae'' (''Dictionary of the Greek Language'', 1572). It was Roget who introduced the meaning "collection of words arranged according to sense", in 1852.
In antiquity, Philo of Byblos authored the first text that could now be called a thesaurus. In Sanskrit, the Amarakosha is a thesaurus in verse form, written in the 4th century.
The study of synonyms became an important theme in 18th-century philosophy, and Etienne Bonnot de Condillac, Condillac wrote, but never published, a dictionary of synonyms.
Some early synonym dictionaries include:
* John Wilkins, ''An Essay Towards a Real Character, and a Philosophical Language'' and ''Alphabetical Dictionary'' (1668) are a "regular enumeration and description of all those things and notions to which names are to be assigned". They are not explicitly synonym dictionaries — in fact, they do not even use the word "synonym" — but they do group synonyms together.
* Gabriel Girard (priest), Gabriel Girard, ''La Justesse de la langue françoise, ou les différentes significations des mots qui passent pour synonymes'' (1718)Gabriel Girard, ''La Justesse de la langue françoise, ou les différentes significations des mots qui passent pour synonymes'', Paris 1718
full text
/ref> * John Trusler, ''The Difference between Words esteemed Synonyms, in the English Language; and the proper choice of them determined'' (1766)John Trusler (anonymously), ''The Difference between Words esteemed Synonyms, in the English Language; and the proper choice of them determined'', London, 176
full text
/ref> * Hester Lynch Piozzi, ''British Synonymy'' (1794)Hester Lynch Piozzi, ''British Synonymy; or, an Attempt Regulating the Choice of Words in Familiar Conversation'', Dublin 179
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/ref> * James Leslie, ''Dictionary of the Synonymous Words and Technical Terms in the English Language'' (1806)James Leslie, ''Dictionary of the Synonymous Words and Technical Terms in the English Language'', Edinburgh, 180
full text
/ref> * George Crabb (writer), George Crabb, ''English Synonyms Explained'' (1818)George Crabb, ''English Synonyms Explained, in Alphabetical Order with Copious Illustrations and Examples Drawn from the Best Writers'', 2nd edition, London 181
full text
/ref> ''Roget's Thesaurus'', first compiled in 1805 by Peter Mark Roget, and published in 1852, follows John Wilkins' semantic arrangement of 1668. Unlike earlier synonym dictionaries, it does not include definitions or aim to help the user to choose among synonyms. It has been continuously in print since 1852, and remains widely used across the English-speaking world. Roget described his thesaurus in the foreword to the first edition:
A sum of money that is owed or due; a liability or obligation to pay
:Society ::Trade and Finance :::Management of Money ::::Insolvency :::::Indebtedness [noun]
An immaterial debt; an obligation to do something
:Society ::Morality :::Duty or obligation ::::[noun]
An offence requiring expiation (figurative, Biblical)
:Society ::Faith :::Aspects of faith ::::Spirituality :::::Sin ::::::[noun] :::::::instance of
full text, 1906 edition
/ref> The article has multiple subheadings, including Nouns of Agent, Verbs, Verbal Expressions, ''etc.'' Under each are listed synonyms with brief definitions, ''e.g.'' "Credit. Transference of property on promise of future payment." The conceptual headings are not organized into a taxonomy. Benjamin Lafaye's ''Synonymes français'' (1841) is organized around morphology (linguistics), morphologically related families of synonyms (''e.g.'' ''logis, logement''), and his ''Dictionnaire des synonymes de la langue française'' (1858) is mostly alphabetical, but also includes a section on morphologically related synonyms, which is organized by prefix, suffix, or construction.
Etymology
The word "thesaurus" comes from Latin ''wikt:en:thesaurus#Latin, thēsaurus'', which in turn comes from Ancient Greek, Greek (''thēsauros'') 'treasure, treasury, storehouse'."thesaurus"''Online Etymology Dictionary''. The word ''thēsauros'' is of uncertain etymology.''Oxford English Dictionary'
''s.v.''
/ref> Until the 19th century, a thesaurus was any dictionary or encyclopedia, as in the ''Thesaurus Linguae Latinae'' (''Dictionary of the Latin Language'', 1532), and the ''Thesaurus Linguae Graecae'' (''Dictionary of the Greek Language'', 1572). It was Roget who introduced the meaning "collection of words arranged according to sense", in 1852.
History
In antiquity, Philo of Byblos authored the first text that could now be called a thesaurus. In Sanskrit, the Amarakosha is a thesaurus in verse form, written in the 4th century.
The study of synonyms became an important theme in 18th-century philosophy, and Etienne Bonnot de Condillac, Condillac wrote, but never published, a dictionary of synonyms.
Some early synonym dictionaries include:
* John Wilkins, ''An Essay Towards a Real Character, and a Philosophical Language'' and ''Alphabetical Dictionary'' (1668) are a "regular enumeration and description of all those things and notions to which names are to be assigned". They are not explicitly synonym dictionaries — in fact, they do not even use the word "synonym" — but they do group synonyms together.
* Gabriel Girard (priest), Gabriel Girard, ''La Justesse de la langue françoise, ou les différentes significations des mots qui passent pour synonymes'' (1718)Gabriel Girard, ''La Justesse de la langue françoise, ou les différentes significations des mots qui passent pour synonymes'', Paris 1718full text
/ref> * John Trusler, ''The Difference between Words esteemed Synonyms, in the English Language; and the proper choice of them determined'' (1766)John Trusler (anonymously), ''The Difference between Words esteemed Synonyms, in the English Language; and the proper choice of them determined'', London, 176
full text
/ref> * Hester Lynch Piozzi, ''British Synonymy'' (1794)Hester Lynch Piozzi, ''British Synonymy; or, an Attempt Regulating the Choice of Words in Familiar Conversation'', Dublin 179
full text
/ref> * James Leslie, ''Dictionary of the Synonymous Words and Technical Terms in the English Language'' (1806)James Leslie, ''Dictionary of the Synonymous Words and Technical Terms in the English Language'', Edinburgh, 180
full text
/ref> * George Crabb (writer), George Crabb, ''English Synonyms Explained'' (1818)George Crabb, ''English Synonyms Explained, in Alphabetical Order with Copious Illustrations and Examples Drawn from the Best Writers'', 2nd edition, London 181
full text
/ref> ''Roget's Thesaurus'', first compiled in 1805 by Peter Mark Roget, and published in 1852, follows John Wilkins' semantic arrangement of 1668. Unlike earlier synonym dictionaries, it does not include definitions or aim to help the user to choose among synonyms. It has been continuously in print since 1852, and remains widely used across the English-speaking world. 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.
Organization
Conceptual
Roget's original thesaurus was organized into 1000 conceptual Heads (e.g., 806 Debt) organized into a four-level taxonomy (general), taxonomy. For example, debt is classed under V..iv: :Class five, ''Volition: the exercise of the will'' ::Division Two: ''Social volition'' :::Section 4: ''Possessive Relations'' ::::Subsection 4: ''Monetary relations''. Each head includes direct synonyms: Debt, obligation, liability, ...; related concepts: interest, usance, usury; related persons: debtor, debitor, ... defaulter (808); verbs: to be in debt, to owe, ... ''see'' Borrow (788); phrases: to run up a bill or score, ...; and adjectives: in debt, indebted, owing, .... Numbers in parentheses are cross-references to other Heads. The book starts with a Tabular Synopsis of Categories laying out the hierarchy, then the main body of the thesaurus listed by Head, and then an alphabetical index listing the different Heads under which a word may be found: Liable, ''subject to'', 177; ''debt'', 806; ''duty'', 926. Some recent versions have kept the same organization, though often with more detail under each Head. Others have made modest changes such as eliminating the four-level taxonomy and adding new heads: one has 1075 Heads in fifteen Classes. Some non-English thesauri have also adopted this model. In addition to its taxonomic organization, the ''Historical Thesaurus of English'' (2009) includes the date when each word came to have a given meaning. It has the novel and unique goal of "charting the semantic development of the huge and varied vocabulary of English". Different senses of a word are listed separately. For example, three difference senses of "debt" are listed in three different places in the taxonomy:A sum of money that is owed or due; a liability or obligation to pay
:Society ::Trade and Finance :::Management of Money ::::Insolvency :::::Indebtedness [noun]
An immaterial debt; an obligation to do something
:Society ::Morality :::Duty or obligation ::::[noun]
An offence requiring expiation (figurative, Biblical)
:Society ::Faith :::Aspects of faith ::::Spirituality :::::Sin ::::::[noun] :::::::instance of
Alphabetical
Other thesauri and synonym dictionaries are organized alphabetically. Most repeat the list of synonyms under each word.''Longman Synonym Dictionary'', Rodale Press and Longman Group, 1986, Charlton Laird, Michael Agnes, eds., ''Webster's New World Roget's A-Z Thesaurus'', Macmillan USA, 3rd edition, 1971, Christine A. Lindberg, ''The Oxford American Thesaurus of Current English'', Oxford University Press, 1999, ''Oxford Thesaurus of English'', 3rd edition, 2009, Some designate a principal entry for each concept and cross-reference it.''Merriam-Webster's Dictionary of Synonyms : Choose Words with Precision'', 1994, uses an asterisk A third system interfiles words and conceptual headings. Francis March's ''Thesaurus Dictionary'' gives for ''liability'': , each of which is a conceptual heading. Francis Andrew March, Francis A. March, Jr., ''March's Thesaurus and Dictionary of the English Language'' (issued under the editorial supervision of Norman Cousins), Doubleday, 1968, p. 59full text, 1906 edition
/ref> The article has multiple subheadings, including Nouns of Agent, Verbs, Verbal Expressions, ''etc.'' Under each are listed synonyms with brief definitions, ''e.g.'' "Credit. Transference of property on promise of future payment." The conceptual headings are not organized into a taxonomy. Benjamin Lafaye's ''Synonymes français'' (1841) is organized around morphology (linguistics), morphologically related families of synonyms (''e.g.'' ''logis, logement''), and his ''Dictionnaire des synonymes de la langue française'' (1858) is mostly alphabetical, but also includes a section on morphologically related synonyms, which is organized by prefix, suffix, or construction.
Contrasting senses
Before Roget, most thesauri and dictionary synonym notes included discussions of the differences among near-synonyms, as do some modern ones. ''Merriam-Webster's Dictionary of Synonyms'' is a stand-alone modern English synonym dictionary that does discuss differences. In addition, many general English dictionaries include synonym notes. Several modern synonym dictionaries in French are ''primarily'' devoted to discussing the precise demarcations among synonyms.B. Lafaye, ''Dictionnaire des synonymes de la langue française'', Hachette 1869, 3rd editionAdditional elements
Some include short definitions. Some give illustrative phrases. Some include lists of objects within the category (hyponyms), ''e.g.'' breeds of dogs.Bilingual
Bilingual synonym dictionaries are designed for language learners. One such dictionary gives various French words listed alphabetically, with an English translation and an example of use. Another one is organized taxonomically with examples, translations, and some usage notes.Information science and natural language processing
In library science, library and information science, a thesaurus is a kind of controlled vocabulary. A thesaurus can form part of an Ontology (computer science), ontology and be represented in the Simple Knowledge Organization System (SKOS). Thesauri are used in natural language processing for word-sense disambiguation and text simplification for machine translation systems.Siddharthan, Advaith. "An architecture for a text simplification system." Language Engineering Conference, 2002. Proceedings. IEEE, 2002.See also
* Conceptual dictionaryBibliography
* W.E. Collinson, "Comparative Synonymics: Some Principles and Illustrations", ''Transactions of the Philological Society'' 38:1:54–77, November 1939, * Gerda Hassler, "Lafaye's ''Dictionnaire des synonymes'' in the History of Semantics" in Sheli Embleton, John E. Joseph, Hans-Josef Hiederehe, ''The Emergence of the Modern Language Sciences'', John Benjamins 1999, , p. 1:27–40 * Werner Hüllen, "Roget's Thesaurus, deconstructed" in ''Historical Dictionaries and Historical Dictionary Research'', papers from the ''International Conference on Historical Lexicography and Lexicology'', University of Leicester, 2002, Max Niemeyer Verlag 2004, , p. 83–94 * Werner Hüllen, ''A history of Roget's thesaurus : origins, development, and design'', Oxford University Press 2004, * Werner Hüllen, ''Networks and Knowledge in Roget's Thesaurus'', Oxford, January 2009, , * Gertrude E. Noyes, "The Beginnings of the Study of Synonyms in England", ''Publications of the Modern Language Association of America (PMLA)'' 66:6:951–970 (December 1951) * Eric Stanley, "Polysemy and Synonymy and how these Concepts were Understood from the Eighteenth Century onwards in Treatises, and Applied in Dictionaries of English" in ''Historical Dictionaries and Historical Dictionary Research'', papers from the ''International Conference on Historical Lexicography and Lexicology'', University of Leicester, 2002, Max Niemeyer Verlag 2004, , p. 157–184References
External links
* * {{Authority control Thesauri (lexicography), Reference works Dictionaries by type Lexical semantics es:Tesauro#En literatura