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

Peyton Duplechien • 07 Sep 2016 • 2 min read

English Language Dictionaries 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.


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.


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. 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.


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.