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List of Online Dictionaries, Thesauri, Acronyms and Encyclopedias and More!

Written by Jacob C. Herman

English Language Dictionaries

Dictionary.com: Searchable and free online dictionary and thesaurus.

Merriam-Webster: Free online dictionary and thesaurus with subscription access to an unabridged dictionary.

Cambridge Dictionaries Onlines: Free online dictionaries, includes dictionary for English learners, standard English dictionary, idioms dictionary and phrasal verbs dictionary.

OneLook: Free dictionary that includes the ability to search with wild cards in place of some letters.

Your Dictionary: Free dictionaries that includes definitions, synonyms and usage examples.

International Dictionaries

Word Web Online: International dictionary that includes American, British, Canadian and Asian English spellings and words.

Macquarie Dictionary: Australian English dictionary with free trial and yearly memberships, updated yearly.

New Zealand English: A dictionary of common New Zealand English terms and their American English equivalents.

Newfoundland English: Free, searchable dictionary of words and phrases peculiar to Newfoundland and the Canadian coast. Includes definition and history for all entries.

Indian English: Searchable dictionary and glossary style list of terms unique to Indian English, but not including terms that originated in India but have made their way into standard English.

Digital Dictionaries of South Asia: A searchable dictionary of Anglo-Indian words. Requires a Unicode font: instructions for obtaining one are included.

Geordie Dictionary: Dictionary of words used in the "Geordie" dialect, which is spoken in north eastern England.

Yorkshire Dicitonary: An alphabetical glossary of terms from the Yorkshire dialect of English.

Technical English Dictionaries

MedlinePlus: A medical dictionary that supports the use of an asterisk in place of a letters if spelling is unknown.

SNIA: Technical dictionary of terms related to storage networking and data and information management.

Tech Dictionary: Technical dictionary that includes computer, Internet and telecommunications terms, filename extensions, HTML tags and domain suffixes.

Tech Terms: Glossary style dictionary of computer and technology terms organized into several large categories and with search feature.

Webopedia: Searchable database of computer and Internet terms.

TechEncyclopedia: Searchable database of computer related terms.

Acronym Dictionaries

Acronym Finder: Searchable database of over 750,000 acronyms from many different areas of society.

Internet Acronyms Dictionary: Glossary style list of Internet acronyms divided by letter.

NetLingo: List of acronyms used for text messaging and instant messaging.

All Acronyms: Comprehensive collection of acronyms divided by category and letter with search feature.

Thesauri

Roget's Thesaurus: Free, searchable version of Roget's Thesaurus from 1911.

Visual Thesaurus: Interactive thesaurus that displays words through a visually represented web of related words. Limited free trial after which a subscription is required.

Wordsmith: Searchable thesaurus with antonyms in addition to synonyms.

Phrase Thesaurus: Search for phrases related to a word rather than just synonyms. Free trial available after which a subscription is required.

Encyclopedias

Encyclopedia Brittannica: Online version of the Encyclopedia Britannica that requires a membership subscription to access most of the articles.

Enotes: A set of browsable encyclopedias divided up by subjects, including history, business, science and science and religion.

Encyclopedia.com: Online encyclopedia featuring information from published reference volumes. Subscription required to access to most content.

Infoplease: Free online access to articles from the Columbia Encyclopedia, Sixth Edition.

World Book Encyclopedia: Online version of World Book Encyclopedia, requires subscription to access.

Miscellaneous

Cha-Cha: Encyclopedic service that offers answers to questions through a live answering service that can be used on mobile phones with text messaging.

Word Reference: Translation and definition dictionary, includes English, French, Spanish, Italian, German and Russian.

Beolingus: German dictionary that includes German-English, German-Spanish and German-Portuguese translations.

The Century Dictionary: An online version of a 100 year old dictionary, useful for looking up historic words. Requires the free DjVu plug-in to search and view.

Dictionary of Americanisms: An online version of a dictionary of American colloquialisms from 1848.

Rhyme Zone: Dictionary that allows searches for definitions, synonyms, antonyms, rhymes and homonyms.

Onelook Reverse Dictionary: Search for words by a concept or definition.

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