• Merriam-Webster Online
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• Merriam-Webster's Open Dictionary
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• Online Dictionary, Encyclopedia and Thesaurus. Free access.
  
  Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia encyclopedia, Wikipedia encyclopedia, Hutchinson encyclopedia, examples from classic literature, pronunciations, word browser, glossa
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• Thinkmap Visual Thesaurus & Dictionary
  
  An online thesaurus and dictionary of over 145,000 words that you explore using an interactive map. It's a tool for people who think visually. The most fun you've ever had with words. The Visual Thesaurus was built using Thinkmap, a data visualization technology.
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• yourDictionary.com • Comprehensive and Authoritative Language Portal
  
  The Web's most comprehensive and authoritative language portal with every resource needed for language study in more than 300 languages.
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  in DICTIONARY AND THESAURUS with authoritative dictionary language portal thesaurus by 5 users

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