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General References

Dictionaries/Thesauri

Merriam Webster Dictionary
http://www.m-w.com

Cambridge Dictionaries Online
http://dictionary.cambridge.org/

The American Heritage Dictionary of the English Language
http://www.bartleby.com/61/

Wordsmyth - The Educational Dictionary - Thesaurus
http://www.wordsmyth.net/

WordNet Online Dictionary and Thesaurus
http://www.vancouver-webpages.com/wordnet/