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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.
Additionally, a thesaurus is used for maintaining a hierarchical listing of terms, usually single words or bound phrases, that aid the indexer in narrowing the terms and limiting semantic ambiguity. The Art & Architecture Thesaurus, for example, is used by countless museums around the world to catalogue their collections.
This is a list of abbreviations which are less commonly used in the subject of an English email header: . AEAP, meaning As Early As Possible.; ASAP, meaning As Soon As Possible.
ISO 25964 is the international standard for thesauri, published in two parts as follows: . ISO 25964 Information and documentation - Thesauri and interoperability with other vocabularies Part 1: Thesauri for information retrieval [published August 2011] Part 2: Interoperability with other vocabularies [published March 2013]
For example, in the Library of Congress Subject Headings [6] (a subject heading system that uses a controlled vocabulary), preferred terms—subject headings in this case—have to be chosen to handle choices between variant spellings of the same word (American versus British), choice among scientific and popular terms (cockroach versus ...
Synonyms are often from the different strata making up a language. For example, in English, Norman French superstratum words and Old English substratum words continue to coexist. [11] Thus, today there exist synonyms like the Norman-derived people, liberty and archer, and the Saxon-derived folk, freedom and bowman.
The 1979 edition of the dictionary, with Patrick Hanks as editor and Laurence Urdang as editorial director, was the first British English dictionary to be typeset from the output from a computer database in a specified format. This meant that every aspect of an entry was handled by a different editor using different forms or templates.
The dictionary is not based on the Oxford English Dictionary (OED) – it is a separate dictionary which strives to represent faithfully the current usage of English words. The Revised Second Edition contains 355,000 words, phrases, and definitions, including biographical references and thousands of encyclopaedic entries.