Get America’s most useful and respected dictionary, optimized for your iPhone, iPad, and Apple Watch. This is the best iOS app for English language reference, education, and vocabulary building.

And now we’ve added new word games! It’s never been more fun to learn new words and test your vocabulary for everyone from English learners to total word nerds. Hundreds of words to test your skills.

Offline access: You’ll have complete access to definitions and synonyms whether or not you’re connected. You will need a connection to view illustrations, hear audio pronunciations, and use voice search.

Selected as a "Best New App" by iTunes.


* Universal app
* No ads
* Full Thesaurus: more than 200,000 word choices, examples, and explanations
* New Vocabulary-Building Quizzes: fun, fast quizzes to learn new words or test your vocabulary
* Voice Search: look up a word without having to spell it
* Word of the Day: learn a new word every day.
* Example Sentences: understand how a word is used in context
* Quick Definitions: perfect for on-the-go lookups
* Audio Pronunciations: voiced by real English speakers, not text-to-speech robots
* Favorite Words and Search History: Keep track of the words that are most important to you
* Favorite Word syncing through iCloud: Share your favorites between devices
* Apple Watch Extension: See Word of the Day, look up words with voice search, and keep track of your favorites from your watch
* Premium Content: over 1000 graphical illustrations, and over 20,000 additional entries covering people, places, and foreign terms

Please click the link to the Application License Agreement, below, which includes our App Privacy Policy.

What’s New

Version 5.0.3

-Thousands of new words!
-User login to share your saved words across all Merriam-Webster Collegiate apps and the website
-Clean, easy-to-read new design

Ratings and Reviews

4.8 out of 5
4.4K Ratings

4.4K Ratings

AintThatAShame ,

Simply the best

This is the only online dictionary I use or recommend. It has so many (free) ways to help people expand their vocabulary, and these extras work for high school & college, to writing for personal reasons. That’s the extra that I use, and love, the most; the common synonyms & antonyms, but also M-W includes a lot much more. The one that’s best for me & my writing is the origin of the words, including the approximate historical date (in centuries) in which the word was “created” and who most likely created it. At times I find that the original meaning (as used when it was created) is very different to the present day meanings!
I went ahead & bought the pro-version, as I use it so often in my writing. I’ve found that M-W the dictionary to be the most user friendly, & helpful. Apologies, but I don’t remember how much is was. I only remember that it wasn’t very much.

Just try it, (even the free version still has almost all the things I’ve mentioned.) use it for awhile & compare it to the other online dictionaries. I’m confident that you’ll pick, & stay with, the Merriam-Webster dictionary. 👍🏼

Lunarseas ,

M-W Defends The English Language

I switched from the Oxford dictionary app I previously had for what might appear to be political reasons yet is actually a non-partisan one: defense of word definitions. When President Trump began tweeting out non-sensical statements that twisted or hollowed out the very meaning of certain words he was trying to use in an Orwellian manner, M-W would tweet out a response that focused on the actual definition of the word in defense of meaningful language. It may have appeared partisan to some, but to me it was a simple & timely reminder that words are not empty vessels. They are not window dressing. They are the window itself and attempts to use them to communicate in a way that is deliberately counter to their actual meaning effectively gaslights an entire language & the very culture that relies on it. I am happy with the app, & even happier supporting a company that recognizes that defending the meaning of words is to defend its core reason for being. Thank you M-W.

ChristFollower002 ,

Nice app, but...

Nice dictionary app, but a few things:

—You ask how we feel way too much, you don’t just ask every couple day, weeks, or months, but mutilple times a day, I’m not sure if it’s based off time, or words looked up, but please, stop. Do not just make it a tad less, but at least make it every couple days or longer that you ask in app how we feel. Until then, I’ll tap the frown face, because this alone is annoying.

Feature requests
—I think it would help a lot if this app had a spell checker. As you type, it’s not just looking for words you might be typing, but words you might have meant. For example if you typed “kat” “cat” would be an option. Of course this would go for bigger and more complex words too. This would also make it easier if the speaker isn’t available, or you just don’t want to use it.
—Another feature I think would be nice is a feature that I think some dictionary apps/programs call “wildcards”. For example you could type “c*d” and it would find all words that start with c and end with d or “c*r*d” for the same thing. * would be any amount of letters between the two letters it’s between. In addition to the * for many letters, a ? for one letter. For example “c?b” would find a words that start with c, end in b, and have one letter in between. “c?a?e” would turn up crate. It would be nice if we could do the above in addition to any number or combination of ? and *.

Please add these features, I really think they would add to the app.


Merriam-Webster, Inc.
262.9 MB

Requires iOS 9.0 and watchOS 4.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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