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
7.8K Ratings

7.8K 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.

M.J. Ocasio ,

Homonyms & Incomplete Definitions

This review is based specifically around the watchOS version of the app, which just got an update. But alas, ‘twas an update that did not address the most critical shortcoming of the app, which is that you can only use voice dictation to look up words. Hence, one will only ever know the definition of “weather” because it will never know whether you meant wether.

Until we get the ability to “scribble” (write in) a word to be looked up, it simply won’t be a very useful app on the watch.

Additionally, it gives poor and totally incomplete definitions on the watch. Take “weather”, for instance. The watch only tells us the (rather useless) definition of the adjective form (of or relating to the side facing the wind). Why not the noun? You know, the one that is at the top of the list of definitions when you look it up on the iOS version of the app.

Furthermore, why does it curtail the definition on the watchOS app? The screen can easily display text, and guess what, that little crown on the side, it allows you to scroll through text! So, theoretically, they could display all the definitions of a word, and we could simply scroll through to find the definition we’re looking for.

And why no support for synonyms? Why why why?? What exactly did they update for the watch in this version of the app? I want my money back.


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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