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
Collegiate Dictionary — Buy Now! ... Get Word of the Day in your inbox! Make your writing more precise and effective with the Merriam-Webster Thesaurus. Our unique ranking system helps you find the right word fast—from millions of synonyms, similar words, and antonyms. An indispensable English language reference. ... Pick the best ...
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
Before paltry was an adjective, it was a noun meaning trash. That now-obsolete noun came from palt or pelt, a dialect term referring to a piece of coarse cloth, or more broadly, to trash. The
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
Oxford Learner's Dictionaries
oxfordlearnersdictionaries.com
Oxford Learner's Dictionaries | Find definitions, translations, and grammar explanations at Oxford Learner's Dictionaries
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.
Videos
I Found my New Favorite Online English Dictionary! - YouTube
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Cambridge Dictionary
dictionary.cambridge.org
Cambridge Dictionary | English Dictionary, Translations & Thesaurus
The most popular dictionary and thesaurus for learners of English. Meanings and definitions of words with pronunciations and translations.
WordWeb
wordweb.info › free
WordWeb: Free English dictionary and thesaurus download
The program has a full dictionary and thesaurus for American, British, Canadian, Australian, Indian, and global English. *WordWeb is fully functional and free if you satisfy the licensing terms.
Cambridge Dictionary
dictionary.cambridge.org › dictionary
Cambridge Free English Dictionary and Thesaurus
Check your understanding of English words with definitions in your own language using Cambridge's corpus-informed translation dictionaries and the Password and Global dictionaries from K Dictionaries. English–Chinese (Simplified) Chinese (Simplified)–English · English–Chinese (Traditional) Chinese (Traditional)–English ... Free word lists and quizzes to create, download and share!
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
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I use www.WordReference.com a lot, the dictionary, translations and thesaurus are great and the forums are excellent.
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.
TheFreeDictionary.com
thefreedictionary.com
Dictionary, Encyclopedia and Thesaurus - The Free Dictionary
The World's most comprehensive free online dictionary, thesaurus, and encyclopedia with synonyms, definitions, idioms, abbreviations, and medical, financial, legal specialized dictionaries
Collins Dictionary
collinsdictionary.com
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.
Invensis Learning
invensislearning.com › home › upskill › 10 helpful english online dictionary and thesaurus resources
10 Helpful English online dictionary and thesaurus resources
Get access to an online thesaurus as well on this site. The Cambridge dictionary offers translations and grammar in addition to word meanings. The official Oxford online dictionary with quizzes, blog posts, and videos.
Microsoft Store
apps.microsoft.com › detail › 9nsmlkmc3wb6
English Dictionary - Offline - Free download and install on Windows | Microsoft Store
English dictionary application is free dictionary which explains the meaning of English words, definitions and many more. It works offline without any further files to download. This is the free offline English dictionary with synonyms, related words and great search and fast response.
FluentU
fluentu.com › home › english › resources › apps › 14 best english dictionary apps (updated for 2025)
14 Best English Dictionary Apps (Updated for 2025) | FluentU English Blog
February 19, 2025 - Longman monolingual and bilingual dictionary is specifically designed for learners and teachers of English, and for people who need to use English as a second language at work. This dictionary has integrated thesaurus, collocations and important grammar information. ... ColorDict Dictionary is an Android-exclusive app that caters to users seeking a free and efficient dictionary tool.
Quora
quora.com › What-is-the-best-English-to-English-online-dictionary
What is the best English to English online dictionary? - Quora
Answer (1 of 13): There are dozens of English to English dictionaries, and most of them have an online equivalent. Instead of asking for the best, you'll have better luck identifying what suits your needs. There are 3 types of dictionaries—learner's, collegiate, and full-size.
Harvard Library
library.harvard.edu › services-tools › oxford-english-dictionary
Oxford English Dictionary | Harvard Library
More than a dictionary, the OED is a comprehensive guide to current and historical word meanings in English.
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.