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Dictionary.com
 One of the the world's most popular dictionary and thesaurus with definitions, synonyms, antonyms, idioms, word origins, quotes, audio pronunciations, example sentences.

Merriam Webster Online Some full text available


For more than 150 years, in print and now online, Merriam-Webster has been America's leading and most-trusted provider of language information.
TheFreeDictionary.com

This is one of the world's most comprehensive dictionary: English, Spanish, German, French, Italian, Chinese, Portuguese, Dutch, Norwegian, Greek, Arabic, Polish, Turkish, Russian, Medical, Legal, and Financial Dictionaries, Thesaurus, Acronyms and Abbreviations, Idioms, Encyclopedia, a Literature Reference Library, and a Search Engine all in one!

Thesaurus.com

This is the Online version of Roget's II: The New Thesaurus, 3rd edition. It is  the largest and most trusted free online thesaurus brought to you by Dictionary.com. Quickly find synonyms and antonyms.
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