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Urban Dictionary
Internet dictionary of slang words and phrases. More than 5 million street lingo words and expressions have been defined by the Internet community. The definitions on Urban Dictionary are meant to be those of slang or subculture words, phrases, and phenomena not found in standard dictionaries and tend to have the newest words. Entries are checked by volunteer editors and rated by site visitor…
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Wiktionary
Free lexical database of the English language, complete with meanings, etymologies, and pronunciations.
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OneLook Multi-Dictionary Search
Look in hundreds of general and specialized dictionaries at once. Great for obscure words or when you want to compare different dictionaries
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Cambridge International Dictionary of English
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Merriam-Webster Collegiate Dictionary
Look up your word in this authoritative Merriam-Webster Online Dictionary, with more than 215,000 definitions with pronunciations
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Wolfram|Alpha
Enter a question or calculation and Wolfram|Alpha uses its built-in algorithms and data to get the answer. A huge set of information and tons of models, methods, and algorithms that make it possible to compute whatever can be computed about anything
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phraseup* Sentence Writer
When you have a sentence that you want to write, but aren't sure how to phrase some parts of it, phraseup* helps by finishing the sentence for you by suggesting possible combinations of words that fit well in the spots where you place a *. Each suggestion is accompanied by definitions, synonyms and translations to other languages.
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Cambridge International Dictionary of Idioms
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Cambridge Learner's Dictionary
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Wordsmyth Educational Dictionary-Thesaurus
Wordsmyth's dictionary contains 50,000 headwords, and very precisely defined and hyperlinked synonyms
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AllWords Pronunciation (audio)
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Cambridge Dictionary of American English
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CMU Pronouncing Dictionary