Online Dictionaries

Collins English Dictionary

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Collins Russian-English Dictionary

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Roget` s Thesaurus

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Oxford English Dictionary

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Oxford Learner's Dictionary

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Oxford Online Collocation Dictionary

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Wikipedia

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Cambridge Dictionary

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Online Etymology Dictionary

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English-Russian Dictionary

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​The American National Corpus

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British National Corpus

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The Corpus of Contemporary American English

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The International Corpus of English

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Other References

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https://study.com/academy/lesson/what-is-a-thesaurus-definition-use-history.html