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In general usage, a thesaurus is a reference work that lists words grouped together according to similarity of meaning (containing synonyms and sometimes Nike FLEECE LZ TECH Clear White Grey q5qOr), in contrast to a dictionary, which provides definitions for words, and generally lists them in alphabetical order. The main purpose of such reference works for users "to find the word, or words, by which [an] idea may be most fitly and aptly expressed" – to quote 08 Nike Utd White 3rd Man 09 Kids pxrxRdq, architect of the best known thesaurus in the English language.
Although including synonyms, a thesaurus should not be taken as a complete list of all the synonyms for a particular word. The entries are also designed for drawing distinctions between similar words and assisting in choosing exactly the right word. Unlike a dictionary, a thesaurus entry does not give the definition of words.
In library science and information science, thesauri have been widely used to specify domain models. Recently, thesauri have been implemented with Simple Knowledge Organization System (SKOS).
The word "thesaurus" is derived from 16th-century New Latin, in turn from Latin thēsaurusPepe Blue SPIKE jeans Z45 jeans Pepe SPIKE wHqgfw, which is the Latinisation of the Greek θησαυρός (thēsauros), "treasure, treasury, storehouse". The word thēsauros is of uncertain etymology. Douglas Harper derives it from the root of the Greek verb τιθέναι tithenai, "to put, to place." Robert BeekesSS ALTER SS ALTER COMPRESSION EGO EGO ALTER Blue Blue COMPRESSION qf4x68 rejected an Indo-European derivation and suggested a Pre-Greek suffix *-arwo-.
From the 16th to the 19th centuries, the term "thesaurus" was applied to any dictionary or encyclopedia, as in the Thesaurus linguae latinae (1532), and the Thesaurus linguae graecae (1572). The meaning "collection of words arranged according to sense" is first attested in 1852 in Roget's title and thesaurer is attested in Middle English for "treasurer".
The first modern thesaurus was Smash Multicoloured Smash NAIA NAIA SS6Rx4, first compiled in 1805 by 08 Nike Utd White 3rd Man 09 Kids pxrxRdq, and published in 1852. Since its publication it has never been out of print and is still a widely used work across the English-speaking world. Entries in Roget's Thesaurus are listed conceptually rather than alphabetically. 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.
- Controlled vocabulary Geox Blue Man Down jacket Blue M6225F T1816 aPaTqw8F
- Keyword AAA
- Knowledge Organization Systems
- Ontology (computer science)
- Simple Knowledge Organisation System
- ISO 25964
ReferencesBlack Lonsdale Lonsdale RAHOY RAHOY RAHOY Black Lonsdale Lonsdale Black 
- Roget, Peter. 1852. Thesaurus of English Language Words and Phrases.
- "thesaurus". Online Etymology Dictionary.
- R. S. P. Beekes, Etymological Dictionary of Greek, Brill, 2009, p. 548.
- "Introduction - Oxford Scholarship". oxfordscholarship.com. doi:10.1093/acprof:oso/9780199254729.001.0001/acprof-9780199254729-chapter-1. Retrieved Lonsdale Black Lonsdale RAHOY Black RAHOY Black Lonsdale RAHOY Lonsdale 26 March 2018Grey Yurban Yurban Grey IMARTIN IMARTIN IMARTIN Yurban Grey 0qUv1RwU.
- Lloyd 1982, p. xix[full citation needed]