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Definition

thesaurus noun

/θɪˈsɔː.rəs/US pronunciation symbol/-ˈsɔːr.əs/ n [C] (plural thesauruses or formal thesauri/θɪˈsɔː.raɪ/US pronunciation symbol/-ˈsɔːr.aɪ/)
a type of dictionary in which words with similar meanings are arranged in groups

(Definition of thesaurus noun from the Cambridge Advanced Learner's Dictionary)
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