English

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

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.
www.askoxford.com/

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

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.
www.collins.co.uk/wordexchange/

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.
www.gutenberg.org/etext/10625

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

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

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

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

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.
dict.die.net/

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

English-dictionary.us - Fast no-frills English dictionary.
www.english-dictionary.us

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

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.
www.freesearch.co.uk/dictionary

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.
www.hyperdic.net/

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

Longman Web Dictionary - Searchable dictionary of contemporary English.
www.ldoceonline.com/

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

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

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

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

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

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

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

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

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

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

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

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.
dictionary-thesaurus.com/