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dictionary and thesaurus

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noun, plural dictionary and thesauruses, dictionary and thesauri.
a dictionary that includes a separate section listing terms with synonyms and antonyms. An online reference site, such as Dictionary.com, provides immediate electronic access to several dictionaries and a thesaurus as well as to other reference sources.
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Origin of dictionary and thesaurus

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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