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 4.3.1

We added push notifications to the app.

Customer Reviews

4.7 out of 5

878 Ratings

878 Ratings

Best Dictionary on iPhone + Mediocre Voice Recognition


I had been using the trial version of this app for a long time and it was great. I only purchased the premium version to support the developers. Fantastic job fellows. I love this dictionary. What I would like to see in future updates is integration with Siri. That's what's missing from this app. Different ways of looking up words, for instance searching definitions, rhyming words, etc. would also be a welcome addition.
Update: voice recognition has become God aweful since you integrated it with Siri a few iterations ago. It was dead-on before. Now it fails 9 out of 10 times. It's practically unusable. Very unfortunate. I'm keeping my 5 stars but please fix this.
2nd update: voice recognition is a lot better now, but still struggles with single syllable words. It needs work and could be much better. I rely on voice search for words I have no idea how they're spelled. So typing can't always replace voice search.
Also, please add fuzzy search. It's a basic yet an absolutely essential feature that should've been baked into the app from the first release.

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.

No problems


I am a long-time user of another on-line dictionary, but when I discovered the superior definitions and word histories within M-W, I switched right away!

I agree with NASA Aerospace Engineer's four main points, and I would like to expand upon point number one. I would love to see an unabridged version of M-W, with a complete explication of word origins, usages, root words, affixes (i.e., prefixes and suffixes) with their meanings, and conjugations. I would also like to see the proper pronunciation of the Greek, Hebrew, Latin, French, Old French, Old English (e.g., Beowulf, & King Alfred's Grammar by Michael D. C. Drout), Middle English (e.g., The Canterbury Tales by Geoffrey Chaucer) etc., words that they originated from. And, if you use an obscure word(s) in your definition — IT SHOULD BE INCLUDED IN YOUR DICTIONARY!!!

I realize that this a lot to ask for, but these are upgrades I would be willing to pay for. Thank you for listening to my rant.


Merriam-Webster, Inc.
185.4 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2017 Merriam-Webster Inc.


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