For queries about the English language in general. The site is devoted to good English. Has an Ask the Experts section, daily and weekly quote.
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You can type in a word to find its definition and you can also order online from a list of useful dictionaries.
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Dictionary on the Encyclopaedia Britannica site. Type in your word to see definition and pronunciation.
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Oxford English Dictionary Online. You have to subscribe to OED to use the service which is updated quarterly with at least 1000 new and revised entries
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