English Online Dictionaries
Online English language dictionaries
Oxford English Dictionary
http://www.oed.com
Collins Online dictionaries
http://www.collinslanguage.com
Merriam-Webster Online
http://www.m-w.com
Dictionary.com
http://www.dictionary.reference.com
alphaDictionary
http://www.alphadictionary.com
Cambridge Dictionaries Online
http://www.dictionary.cambridge.org
The American Heritage Dictionary of the English Language
http://www.bartleby.com/61/
English Dictionary
http://www.wordthrill.com/
English dictionary
http://www.theenglishdictionary.org/
RapiDefs English dictionary>
http://www.rapidefs.com
English Literature Dictionary & Glossary for students
http://www.tuition.com.hk/english-literature/
Memidex – and English dictionary with definitions, audio and etymology
http://www.memidex.com
Vocabulary.com – the world’s fastest, smartest dictionary
http://www.vocabulary.com/dictionary/