• Dictionary.com
  Free online English dictionary, thesaurus and reference guide, crossword puzzles and other word games, online translator and Word of the Day.
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• Wiktionary
  The English-language Wiktionary, a collaborative project to produce a free, multilingual dictionary with definitions, etymologies, pronunciations, sample quotations, synonyms, antonyms and translations.
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• Ninjawords - a fast online dictionary
  A really fast dictionary... fast like a ninja.
  A really fast online dictionary
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• Urban Dictionary: Define Your World
  Urban Dictionary is a slang dictionary with your definitions. Define your world
  Urban Dictionary is a slang dictionary with your definitions. Define your world
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