An online dictionary is a dictionary that is accessible via the Internet through a web browser. They can be made available in a number of ways: free, free with a paid subscription for extended or more professional content, or a paid-only service. Some online dictionaries are organized as lists of words, similar to a glossary, while others offer search features, reverse lookups, and additional language tools and content such as verb conjugations, grammar references, and discussion forums.
List of online dictionaries Wikipedia
The following is a concise list of online English dictionaries whose definitions are based upon well-established content.American Heritage Dictionary American Heritage Dictionary of the English Language, Fifth Ed.
Collins Online Dictionary Collins Unabridged English Dictionary; Collins Unabridged Thesaurus; Collins Webster's American English Dictionary
Dictionary.com Dictionary.com Unabridged, based on the Random House Webster's Unabridged Dictionary
Merriam-Webster OnLine Merriam-Webster Online Dictionary
Oxford Dictionaries Online Oxford Dictionary of English; New Oxford American Dictionary; Oxford Thesaurus of English; Oxford American Writer's Thesaurus
Oxford Advanced Learner's Dictionary Oxford Advanced Learner's Dictionary
Cambridge Dictionaries Online Cambridge Advanced Learner's Dictionary
Longman Longman Dictionary of Contemporary English
Macmillan Macmillan English Dictionary for Advanced Learners
Linguee free multilingual dictionary and contextual sentences. English, German, French, Spanish, Portuguese, Russian, Dutch, Italian, and Polish, among other languages.
dict.cc a free user-run multilingual dictionary centered on English and German, with the capacity to translate to Spanish, French, Icelandic, Esperanto, Albanian, Italian and many more.
LEO (website) free multilingual collaborative dictionary for German
Madura English-Sinhala Dictionary free English to Sinhala and vice versa online dictionary.
Multitran a multilingual Internet-based dictionary centered on Russian, and provides an opportunity of adding your own translation
Ultralingua free and premium multilingual dictionary
Webster's Online Dictionary: The Rosetta Edition: a multilingual online dictionary which compiles different online dictionaries and encyclopedia including Wiktionary and Wikipedia.
Wiktionary a collaborative project run by the Wikimedia Foundation
Free On-line Dictionary of Computing
Logos Dictionary Free online with additional premium content
Online Etymology Dictionary
Pseudodictionary Dictionary of user submitted made-up words (humour)
Reference.com Word and language tool portal
Urban Dictionary Dictionary of slang.
WordNet a word database.
Wordweb Free and premium online English thesaurus and dictionary for Windows.
Other specific languages
Academic Dictionary of Lithuanian
Dictionary of the Scots Language
Ekşi Sözlük Turkish collaborative dictionary
e-mahashabdkosh bi-Lingual and Bi-Directional Hindi/English dictionaries
Plattmakers Low Saxon online dictionary
Susning.nu Free Swedish online dictionary, opened 2001, now defunct
Svenska Akademiens ordbok
tuBabel.com Spanish slang and regionalisms
Van Dale Dictionary of the Dutch language
William Whitaker's Words Latin dictionary
Woordenboek der Nederlandsche Taal Dictionary of the Dutch language (free registration required)
Yeminlisozluk Turkish translators' dictionary