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

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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 Online: Free online dictionaries, includes a dictionary for English learners, a standard English dictionary, an idioms dictionary, and a 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 include definitions, synonyms, and usage examples.

International Dictionaries

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

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

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

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

Technical English Dictionaries

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

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

Webopedia: Searchable database of computer and Internet terms.

Acronym Dictionaries

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

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

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

Thesauri

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.

Encyclopedias

Encyclopedia Britannica: 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 is required to access most content.

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

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

Miscellaneous

VoiceNation: 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.

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