Oxford English Dictionary Online (OED)
The premier English language dictionary. This is a paid subscription dictionary; it is the best place to start.
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Oxford Lexico Dictionaries (Free. English & Spanish version)
This is a simple version of Oxford Dictionaries. For more in-depth definitions, grammar, synonyms, etc. use the premier Oxford English Dictionary (OED).
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Roget's International Thesaurus of English Words & Phrases
From Bartleby.com - Great Books Online
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Thesaurus of Geographic Names
From the Getty Information Institute.
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WordNet
A lexical database for English that provides a network of meaningfully related words and concepts. Similar to a thesaurus, WordNet's structure makes it a useful tool for computational linguistics and natural language processing.
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Your Dictionary.com
Includes over 2,500 dictionaries and grammars in over 300 languages, dictionary, thesaurus, glossary and reference articles, games that build language skills, and a forum for discussing language issues with the logophile community.
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