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Oxford English Dictionary The OED is the definitive record of the English language, featuring 600,000 words, 3 million quotations, and over 1,000 years of English
Oxford Learners Dictionaries | Find definitions, translations, and . . . The largest and most trusted free online dictionary for learners of British and American English with definitions, pictures, example sentences, synonyms, antonyms, word origins, audio pronunciation, and more Look up the meanings of words, abbreviations, phrases, and idioms in our free English Dictionary
Wiktionary, the free dictionary Wiktionary has grown beyond a standard dictionary and now includes a thesaurus, a rhyme guide, phrase books, language statistics and extensive appendices We aim to include not only the definition of a word, but also enough information to really understand it Thus etymologies, pronunciations, sample quotations, synonyms, antonyms and translations are included
Dictio Dictio is a weird beast - a bit of a mix between a dictionary and a thesaurus It uses the awesome content from the WordNet Project by the Princeton University and we have packaged it into a minimalistic, fast and easy to use app for iPad and iPhone