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AskOxford.com - Free dictionary produced by Oxford University Press. Answers questions on English grammar, spelling, and usage. Ability to search a dictionary of words, names or quotations; also provides help with writing and for crosswords and puzzles.Merriam-Webster OnLine - Free searchable dictionary and thesaurus, word games, a word of the day, and many other English language and vocabulary reference tools and resources.
AllWords.com Features two modern English dictionaries, multilingual search, and translation. Also features a guide to language sites on the web and a language discussion forum. http://www.allwords.com/
The Beet Foundation General purpose online English language dictionary and Thesaurus. http://beetfoundation.com/words/
Beginners English Dictionary Contains over 2000 everyday words and phrases. Includes Idioms and Expression Pages. http://www.beginnersenglishdictionary.com
Cambridge Dictionary Free online dictionary from Cambridge University Press. http://dictionary.cambridge.org/
The Century Dictionary Online Free 500,000 word dictionary of English with an encyclopedia and world atlas. Contains headword lookup and a full text search of 22 million words of text. http://www.global-language.com/CENTURY/
Chambers 21st Century Dictionary Access to the free dictionary through a single search interface. http://www.chambersharrap.co.uk/chambers/features/chref/chref.py/main
Cooldictionary.com Free edition of a complete Webster dictionary. Fully crosslinked. Includes sound. http://www.cooldictionary.com/
DataSegment Dictionary Find definitions by alphabetical browsing or word lookup. Powered by several print dictionaries. http://onlinedictionary.datasegment.com/
DICT Development Group A WWW interface to several freely available on-line dictionaries, including Webster's 1913, the Jargon File, the US Gazetteer, and Easton's Bible Dictionary. http://www.dict.org/
Dictionary of Difficult Words Search or browse this dictionary of more than 13,000 words. http://www.tiscali.co.uk/reference/dictionaries/difficultwords/
Dictionary.co.uk Searchable dictionary which includes the ability to add a word. http://www.dictionary.co.uk/
Dictionary.net A dictionary database of word and phrase definitions from eight different sources. http://www.dictionary.net/
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
eLook Dictionary Provides definitions, synonyms, and related words. http://www.elook.org/dictionary/
GrokItBetter.com A visual dictionary. Contains a graphical presentation of the semantic context of words, including synonyms, generalisations and other semantic relations. http://grokitbetter.com
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/
HyperDictionary.com Includes a thesaurus and searchable dictionaries for English, computers, dreams and medicine. http://www.hyperdictionary.com/
Information Please Dictionary Infoplease's free online dictionary. Features almanacs, an encyclopedia, and an atlas. http://www.infoplease.com/dictionary.html
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
Linguee One can search many bilingual texts in English and German for words and expressions. http://www.linguee.com/
Memidex Dictionary An online dictionary originally based on WordNet, contains extensive cross-references, hierarchical links, and a complete listing of inflections. http://www.memidex.com/
Middle English Dictionary A concise dictionary of middle English. Time period is from A.D. 1150 to 1580. http://www.gutenberg.org/etext/10625
Mnemonic Dictionary Mnemonic Dictionary is a resource which provides memory aids for each word. http://www.mnemonicdictionary.com/
OneLook Dictionaries Contains a database of words, terms, names, and acronyms. http://www.onelook.com/
Online Dictionary - Die.net Cross-referenced definitions, spelling correction, and searches from WordNet and Webster's. http://dict.die.net/
Oxford Advanced Learner's Dictionary Allows users to search, free of charge, for entries in the latest (year 2000) edition of the Oxford Advanced Learner's Dictionary. http://www.oup.com/elt/oald/
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
Reference Dictionary A dictionary of words and phrases on the verge of extinction. http://referenceer.blogspot.com/
Suggestive Dictionary An English dictionary which suggests words as one types. Helps explore new words and meanings. http://www.objectgraph.com/dictionary/
Ultralingua Searchable dictionary of the English language, with standard, reverse and phonetic lookup. Also links to a range of other language resources. http://ultralingua.com/online-dictionary/
Virtual Dictionary Searchable English language dictionary shows results in synonym sets. http://www.vdictionary.com/
Voycabulary Online dictionary and thesaurus web linking lookup reference tool. http://www.voycabulary.com/
Wiktionary English language Wiki dictionary from the Wikimedia Foundation. http://en.wiktionary.org/
Word Central Student dictionary and rhyming dictionary online at Merriam-Webster's website. Daily Buzzword by subscription. http://www.wordcentral.com/
Word Information Dictionary A dictionary of English words derived from Latin and Greek Sources. Ability to find the Latin and Greek origins or etymologies. http://www.wordinfo.info
Word Spy Site dedicated to recently coined words and existing words revived into modern usage. http://www.wordspy.com/
Word Sytes Use this online dictionary to search for definitions in WordNet, Webster's and many other databases. http://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. http://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. http://dictionary-thesaurus.com/