1. Babylon
The single click translator dictionary, convertor, and information tool. Download Your Free Trial Now !

http://www.babylon.com/
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2. Dictionary.com
Dictionary.com is a multi-source dictionary search service produced by Lexico Publishing Group, LLC, a leading provider of language reference products and services on the Internet.
http://www.dictionary.com/
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3. GuruNet
With GuruNet Free, you get instant access to a first-class dictionary, spell-checker, thesaurus and word translations, accessed by Alt-clicking on any word or phrase in any Windows document.
http://www.gurunet.com/
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4. The Oxford English Dictionary
The Oxford English Dictionary is the accepted authority on the evolution of the English language over the last millennium. It is an unsurpassed guide to the meaning, history, and pronunciation of over half a million words, both present and past. It traces the usage of words through 2.5 million quotations from a wide range of international English language sources, from classic literature and specialist periodicals to film scripts and cookery books.
http://www.oed.com/
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5. yourDictionary.com (YDC)
yourDictionary.com
Who Are We?
yourDictionary.com provides the most comprehensive and authoritative portal for language and language-related products and services on the web with more than 1800 dictionaries with more than 250 languages.
http://www.yourdictionary.com/
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