Merriam-Webster
merriam-webster.com
Merriam-Webster: America's Most Trusted Dictionary
Find definitions for over 300,000 words from the most authoritative English dictionary. Continuously updated with new words and meanings.
Games
Challenge yourself with dozens of word games, puzzles, crosswords, and quizzes with new content every day!
Thesaurus
Make your writing more interesting, beautiful, and successful with the only thesaurus developed from Merriam-Webster dictionary.
Word Finder
Word Finder helps you win word games. Search for words by starting letter, ending letter, or any other letter combination. We’ll give you all the matching words in the Merriam-Webster dictionary. The most complete word search of its kind.
Word of the Day
Build your vocabulary: get a new word every day from Merriam-Webster dictionary. Learn the meaning, history, and fun facts about Bravado. Also available as podcast, newsletter, and on the finest social networks.
Factsheet
Parent company Encyclopædia Britannica, Inc.
Founded 1831; 194 years ago (1831)
Founder George Merriam, Charles Merriam
Parent company Encyclopædia Britannica, Inc.
Founded 1831; 194 years ago (1831)
Founder George Merriam, Charles Merriam
Cambridge Dictionary
dictionary.cambridge.org › us
Cambridge Dictionary: Find Definitions, Meanings & Translations
1 week ago - The most popular dictionary and thesaurus for learners of English. Definitions and meanings of words with pronunciations and translations.
Videos
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Dictionary.com
dictionary.com
Dictionary.com | Meanings & Definitions of English Words
The world's leading online dictionary: English definitions, synonyms, word origins, example sentences, word games, and more. A trusted authority for 25+ years!
Oxford English Dictionary
oed.com
Oxford English Dictionary
An unsurpassed guide for researchers in any discipline to the meaning, history, and usage of over 500,000 words and phrases across the English-speaking world.
WordReference
wordreference.com
English to French, Italian, German & Spanish Dictionary - WordReference.com
Free online dictionaries - Spanish, French, Italian, German and more. Conjugations, audio pronunciations and forums for your questions.
Oxford Learner's Dictionaries
oxfordlearnersdictionaries.com › us
Oxford Learner's Dictionaries | Find definitions, translations, and grammar explanations at Oxford Learner's Dictionaries
4 days ago - The largest and most trusted free online dictionary for learners of British and American English with definitions, pictures, example sentences, synonyms, antonyms, word origins, audio pronunciation, and more. Look up the meanings of words, abbreviations, phrases, and idioms in our free English Dictionary.
Johnsonsdictionaryonline
johnsonsdictionaryonline.com
Johnson's Dictionary Online
Supported by the University of Central Florida, NEH and Center for Humanities and Digital Research (CHDR) .
Reddit
reddit.com › r/englishlearning › most comprehensive english dictionary online
r/EnglishLearning on Reddit: Most comprehensive English dictionary online
December 13, 2021 -
Hi, which of the online English dictionaries have most complete definition of words and sometimes have meaning of specialized fields like Medical?
Top answer 1 of 3
5
There is no single best or most complete or most authoritative dictionary or dictionary website, and it's best if you don't rely on just one, because dictionaries have different purposes or philosophies and will differ in how they present senses or nuances. Also, general purpose dictionaries are aimed at native speakers, and may provide definitions that seem circular or overly complex to a learner. To that point, I recommend using OneLook , which links you directly to entries from several different dictionary websites. For learners, I recommend Oxford OALD , Macmillan , Cambridge CALD , Longman , or Merriam-Webster MWLD (especially for American usage). Collins COBUILD is also popular, but I personally don't like the way they present the material. The Cambridge Dictionary and Collins Dictionary websites can be useful because they search multiple dictionaries at once, although in my experience (including on this sub), this has served to confuse learners as much as it helps them. For general purpose dictionaries, Lexico (formerly Oxford Living Dictionaries) and Cambridge are reliable for British uses and Merriam-Webster and the American Heritage Dictionary for American uses. AHD is more linguistically conservative than MW. If you are dealing with historical texts and want something truly comprehensive, the most authoritative resource is the Oxford English Dictionary (not just any English dictionary published by Oxford, but the work known as the OED). This is a historical dictionary that attempts to catalog all meanings that all words have ever had since the dawn of the English language itself, including senses that may not have been used in hundreds of years. It is structured very, very differently from general purpose dictionaries and not intended for everyday use, but it is fascinating to read through some of the entries.
2 of 3
2
I use www.WordReference.com a lot, the dictionary, translations and thesaurus are great and the forums are excellent.
Collins Dictionary
collinsdictionary.com › us
Collins Online Dictionary | Definitions, Thesaurus and Translations
Pioneers in Language Reference for 200 years. Popular and trusted online dictionary with over 1 million words. Find definitions, meanings, synonyms, pronunciations, translations, origin and examples.
Bab.la
en.bab.la
Online dictionaries by bab.la - loving languages
Please choose different source and target languages. ... bab.la is your go-to portal for translating, learning, and practicing languages with more than 60 online dictionaries, conjugation tables, multilingual phrases, and much more.
App Store
apps.apple.com › us › app › oxford-dictionary-learn-words › id978674211
Oxford Dictionary Learn Words App - App Store
The world's most trusted language reference with 15 powerful dictionaries, including English, millions of word definitions, synonyms, etymology, and more, all in one app. Discover the power of words with the Oxford Dictionary, the definitive ...
Longman Dictionary
ldoceonline.com
Longman Dictionary of Contemporary English | LDOCE
Longman English Dictionary - the leading dictionary for learners of English of all levels: definitions, idioms, examples and more.
WordWeb
wordwebonline.com
WordWeb Online Dictionary and Thesaurus
WordWeb is a comprehensive international dictionary and word finder. WordWeb fully covers American, British, Australian, Canadian and Asian English spellings and words.
The American Heritage Dictionary
ahdictionary.com
The American Heritage Dictionary entry:
The much-anticipated Fifth Edition of The American Heritage Dictionary of the English Language is the premier resource about words for people who seek to know more and find fresh perspectives.
Encyclopedia Britannica
britannica.com › dictionary
Find Definitions & Meanings of Words | Britannica Dictionary
3 weeks ago - Clear and simple definitions in American English from Britannica's language experts. More usage examples than any other dictionary.
Google Play
play.google.com › store › apps › details
Oxford Dictionary & Thesaurus - Apps on Google Play
October 23, 2025 - The 15 biggest Oxford dictionaries at your fingertips Powered by Oxford Languages, Oxford Dictionary is widely regarded as one of the highest authorities in the study and reference of languages today.
Collins Dictionary
collinsdictionary.com › us › dictionary › english
Collins English Dictionary | American Definitions, Examples & Synonyms
An unparalleled resource for word lovers, word gamers, and word geeks everywhere, Collins online Unabridged English Dictionary draws on Collins extensive language databases and covers many literary and rare words useful for crossword solvers ...
Cambridge Dictionary
dictionary.cambridge.org › us › dictionary › english
Cambridge English Dictionary: Definitions & Meanings
1 week ago - Get clear, simple definitions from the British, American, and Business dictionaries with just one search! Hear the words spoken in British and American English
Latinitium
latinitium.com › latin-dictionaries
Dictionaries | Latinitium
A Copious and Critical English-Latin Dictionary. The English-Latin dictionary of Smith & Hall, originally published in 1871 under the title A Copious and Critical English-Latin Dictionary, is widely regarded as the best and, with 29 000 headwords, most extensive lexicon for translating from English into Latin ever written. Thanks to the effort of Johan Winge, it is now, for the first time, available online in a fully digitized and searchable form, exlusively here on Latinitium!
University of Michigan Library
quod.lib.umich.edu › m › middle-english-dictionary › dictionary
Middle English Dictionary
The world's largest searchable database of Middle English lexicon and usage for the period 1100-1500. An invaluable resource for lexicographers, language scholars, and all scholars in medieval studies. Read more about the dictionary · Image: The Ellesmer Manuscript of Geoffrey Chaucer's The Canterbury Tales, c. 1400-1405. Shown is the introduction to "The Knight's Tale." Available online ...