Free Online English Dictionary and Thesaurus

Dictionary

• Dictionary.com
• Cambridge Dictionaries Online
• alphaDictionary
• The American Heritage Dictionary of the English Language
• infoplease
• AllWords.com
• Urban Dictionary
• The Compact Oxford English Dictionary
• Fact Monster
• Webster's Online Dictionary
• RhymeZone
• Wiktionary
• Ultralingua Online Dictionary

Thesaurus

• Thesaurus.com
• Roget’s II: The New Thesaurus
• Aiksaurus
• Online Thesaurus
• eLook.org
• itanda
  

Dictionary and Thesaurus

• Merriam-Webster Online
• yourDictionary.com
• Dictionary - MSN Encarta
• TheFreeDictionary
• Wordsmyth
• WordWeb