
OneLook is a meta-dictionary. Enter an English language word or acronym, and OneLook will search its index of over 900 general and special interest dictionaries for the definition.

Oxford Reference Online is the core collection which contains about 100 dictionary, language reference, and subject reference works published by Oxford University Press.

The definitive record of the English language. Chronological examples of usage make it especially good for researching the historical development of words.

While not as comprehensive as other sources, this is a good quick reference site from an authority in dictionary publishing.

Provides a variety of links to specialized subject dictionaries in many different areas.

A graphical dictionary/thesaurus that allows you to see the relations between words, concepts, and associations.

An online project that gives as much information as possible for words, such as images, statistics, pronounciation, and multple definitions.