Best Free Dictionary, Encyclopedia and Translator

• Wikipedia allows users to type a word or phrase to search for useful information from millions of articles written collaboratively online by volunteers around the 
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• world. It's a good and handy encyclopedic reference and a frequently updated news resource for you.
• LDOCE, an online version of the Longman Dictionary of Contemporary English, provides a quick search for a word or phrase, with widgets available for adding to your browser search bar, blog or personal website.
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• Wordnik, "you don't get just a definition when you look up a word. You get example sentences, related words, charts, images from Flickr, pronunciations, etymologies, tags, Twitter segments and more." 
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• Thesaurus.com, a popular site to search for word definitions, synonyms and antonyms with filtering by parts of speech or word classes and suggestions for nearby words.
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• Google Translate, enter text, a webpage address, or upload a document for translation from one language into another with auto detection of the source language. The translated result from an uploaded document is presented without preserving the layout or embeded images though.
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• Bing Translator, translate texts or entire web pages from one language into another, with auto detecting the source language and other features such as synchronized highlights and bilingual viewing layouts for a webpage translation.