Merriam-Webster OnLine - A free, searchable on-line 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.
Word Assault - Looks up multiple words simultaneously using several databases including Webster's, Easton's, Wordnet, and the Devil's Dictionary.
Word Central - Student dictionary and rhyming dictionary online at Merriam-Webster's website. Daily Buzzword by subscription.
Cambridge International Dictionaries - Free online dictionary from Cambridge University Press.
Research-It - Includes several dictionaries and a thesaurus as well as online tools for shipping and mailing, currency exchange, and language translation.
Dictionary Building Software for Reporters - Software program for realtime reporters and captioners that lists many diverse vocabulary lists.
Cooldictionary.com - Free edition of a complete Webster dictionary. Fully crosslinked.
Skeptic's Dictionary - Skeptical definitions and essays on occult, paranormal, supernatural and pseudoscientific ideas and practices with references to the best skeptical literature.
Information Please Dictionary - Infoplease's free online dictionary. Features almanacs, an encyclopedia, and an atlas.
Dictionary Society of North America - An international organization of librarians, booksellers, translators, linguists, publishers, writers, journalists, and collectors. Founded in 1975 to further research in dictionary making, study, collection, and use. Member of the American Council of Learned Societies.
High Definition Dictionary - Mixed collection of drug terminology with an apparently arbitrarily selected mix of other, unrelated terms. Dictionary accepts contributions of new terms.
The Century Dictionary Online - Free 500,000 word dictionary of English with an encyclopedia and world atlas. Uses DjVu and JPEG formats to display page images. Has headword lookup and full text search of 22 million words of underlying text.
Dictionary of Comprehension - A Dictionary of Comprehension in different languages.
The Alternative Dictionaries - Includes a list of slang terms and phrases in various languages.
Lighting Design Terminology - Explanations of terms used in architectural lighting and lighting simulation.
Word Spy - Site dedicated to recently coined words and existing words revived into modern usage.
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.
The Newbury House Online Dictionary - Search over 40,000 entries to get clear concise definitions and when available related pictures.
Strange Dictionaries - Free online versions of the Dictionary of One-Letter Words, the Dictionary of All-Vowel Words, the Dictionary of All-Consonant Words, and other strange dictionary resources.
The Superhero Dictionary - Each entry compares a superhero's name with its real life meaning and includes comparison pictures and pronunciations.
Dictionary of Difficult Words - Search or browse this dictionary of more than 13,000 words.
Collection of Web-Dictionaries - Sorted list of online dictionaries of more than 50 languages, mostly bilingual.
Dictionaries, Lexica and Lexical Resources - Collection of links to various online dictionaries and other lexical references.
Dictionaries on the Web - Link collection -- over 100 links to various dictionaries of about 40 languages.
Glossaries - Collection of more than 2400 links to glossaries and dictionaries.
EZresearch.com - Provides a directory of dictionaries.
Free Dictionary and Free Translation - Collection of free dictionaries and translation sites. Supports searching all dictionaries with just one mouse click.
Dictionary.com - Free online dictionary search, translator, word of the day, crossword puzzles and word games, and vocabulary learning resources for many languages.
Campus Program: Language Dictionaries - A compilation of a large number of dictionary websites grouped by language.
Dictsearch - Search a variety of dictionaries including monolingual, bilingual, and specialty dictionaries.
The Glossarist - Searchable directory of glossaries and topical dictionaries containing terms and definitions on hundreds of subjects.
KnowPlay? - Simple and integrated access to dictionaries, thesauri, encylopedias, and quotation databases.
Lexicool - Searchable directory of bilingual and multilingual dictionaries.
On-Line Dictionaries - Online specialty dictionaries for English, Russian, German, Finnish and Latin.
Voycabulary - Online dictionary and thesaurus web linking lookup reference tool.
yourDictionary.com - Comprehensive index of on-line dictionaries in more than 200 different languages. Includes an index of on-line grammars, word of the day by email, and several pages of linguistic fun.
Glossaries by Language - Directory of multilingual dictionaries and dictionaries on specific subjects, alphabetized by language.
Planet Translation - Directory of dictionaries, including unilingual, multilingual, and topical resources.
HyperDictionary.com - Includes a thesaurus and searchable dictionaries for English, computers, dreams and medicine.
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.
The Online Dictionary List - A large directory of online dictionaries, both in English and bilingual, including specialist dictionaries.
Dictionary Link - A directory of free online language resources such as dictionaries, thesauruses, language translators, and encyclopedias.
eLook Dictionary - Provides definitions, synonyms, and related words.
Webster's Online Dictionary: The Rosetta Edition - This database doubled with a metasearch tool extracts records from a variety of online and public-domain paper dictionaries, both general and specialized. It offers English definitions, as well as translations from/to a hundred languages.
Dictionarium - Directory of English and foreign-language dictionaries.
Web Dictionaries - Multi-search tool by Tinh Van, which consults English-only dictionaries, and Vietnamese into English or French translation dictionaries.
Quotations: The Yale Dictionary - Project to create an searchable online database and a quotation dictionary from Yale University Press.
Search-It-All - A collection of reference tools.
WordWeb - A free English thesaurus and dictionary for Windows.
Bin's On-Line Dictionary - Search various on-line dictionaries.
Hypertext Webster Gateway - WWW interface to multiple English dictionaries.
Cynic's Dictionary - Irreverent and amusing definitions.
Terminological Information System - A simplified version of the European Union terminological database.
Inter Active Terminology for Europe (IATE) - The European Commission's multilingual term bank. Particularly rich in technical and specialized terminology related to European Union policy.