New Dictionary Words
- An interactive quiz to test you knowledge of new words addd to the Merriam-Webster dictionary.
- http://reference.aol.com/quizzes/newwords

Wiktionary
- English language Wiki dictionary from the Wikimedia Foundation.
- http://en.wiktionary.org/

Webster's Unabridged Dictionary of 1913
- Forms version. Allows browsing headwords.
- http://www.bibliomania.com/2/3/257/

A Concise Dictionary of Middle English
- From A.D. 1150 to 1580. By A.L. Mayhew and Walter W. Skeat. In plain text, or as a zip file, from Project Gutenberg.
- http://www.gutenberg.org/etext/10625

Suggestive Dictionary
- An english dictionary which suggests words as you type. Helps explore new words and meanings.
- http://www.objectgraph.com/dictionary/

Elizabethan Dictionary
- Provides the origins and meanings of Elizabethan words and vocabulary including obscure Shakespearean expressions.
- http://www.william-shakespeare.info/william-shakespeare-dictionary.htm

Collins Word Exchange
- Dictionary searches a variety of word and phrase resources, including the Collins English Dictionary, texting abbreviations, internet links, and words submitted by users.
- http://www.collins.co.uk/wordexchange/

English-dictionary.us
- Fast no-frills English dictionary.
- http://www.english-dictionary.us

The Jargon Database
- A repository of popular neologisms, management speak, and technical terms relevant to various regions, jobs, and cultures, and organized by categories.
- http://www.jargondatabase.com

Macmillan English Dictionaries
- Resource site for the Macmillan range of dictionaries.
- http://www.macmillandictionary.com/

Longman Web Dictionary
- Searchable dictionary of contemporary english
- http://www.ldoceonline.com/

Plan of an English Dictionary (1747)
- Letter written by Samuel Johnson to the Earl of Chesterfield setting out his plan for an English Dictionary.
- http://andromeda.rutgers.edu/~jlynch/Texts/plan.html

Dictionary of Indian English
- Regionalisms defined.
- http://www.vsubhash.com/desienglish.asp

Vdictionary.com
- Searchable English language dictionary shows results in synonym sets.
- http://www.vdictionary.com/

WordIQ Dictionary
- Searchable definitions available in a variety of dictionaries including Webster's, a legal dictionary, a dream dictionary, and an encyclopedia.
- http://www.wordiq.com/dictionary.html

Word Sytes
- Use this online dictionary to search for definitions in WordNet, Webster's and many other databases.
- http://word.sytes.org/

An Internet Dictionary.
- Online dictionary lets you search for definitions, cross-references English dictionaries based on multiple databases. Cross-references English dictionaries based on multiple databases. Downloadable software gives the ability to integrate the dictionary wi
- http://dict.aiedu.com/

Dictionary.net
- Comprehensive dictionary database of word and phrase definitions from 8 different sources.
- http://www.dictionary.net/

Freesearch Dictionary
- A British English dictionary powered by the Cambridge University Press that contains around 150,000 words. The site offers a search feature or can be browsed by letter.
- http://www.freesearch.co.uk/dictionary

SmartDictionary.com
- Supports both searching and browsing and encourages user contributions.
- http://www.smartdictionary.com/

Die.net Online Dictionary
- Cross-referenced definitions, spelling correction, and searches from WordNet, Webster's, and a variety of specialized sources. Supports regular expressions and the DICT protocol.
- http://dict.die.net/

Dictionary.com
- Online English dictionary, thesaurus and reference guide. Includes word games, online translator, and word of the day feature.
- http://dictionary.reference.com/

The Wordsworth Compendium
- Program containing over 516,000 English words and phrases to solve word puzzles. Useful for the search and manipulation of words in all aspects of logological activities.
- http://dictionary-thesaurus.com/

DataSegment.com: Online Dictionary
- Find definitions by alphabetical browsing or word lookup. Powered by several print dictionaries.
- http://onlinedictionary.datasegment.com/

The Beet Foundation
- General purpose online English language dictionary and Thesaurus.
- http://beetfoundation.com/words/

HyperDic
- Based on the WordNet lexical database and thesaurus, this dictionary covers only a selection of the most frequent English words. Includes synonyms, antonyms, examples and pronunciation, and links between related words.
- http://www.hyperdic.net/

Ultralingua Online Dictionary
- Searchable dictionary of the English language, with standard, reverse and phonetic lookup. Also links to a range of other language resources.
- http://www.ultralingua.net/

The English-to-American Dictionary
- A humo(u)rous resource for Americans learning British/Scottish English.
- http://english2american.com/

AskOxford.com
- For questions on English grammar, spelling, and usage; to search a dictionary of words, names or quotations; for help with writing; for crosswords and puzzles.
- http://www.askoxford.com/

The American Heritage Dictionary of the English Language
- Online publication of the 4th edition. Featuring audio word pronunciations, illustrations.
- http://www.bartleby.com/61/