The AMERICAN HERITAGE ENGLISH DICTIONARY is one of the most comprehensive and accessible resources available on any mobile device. This is the perfect solution to use at school, in the office, or at home!

Exhaustively researched and thoroughly revised, the Fifth Edition contains 10,000 new words and phrases, over 4,000 dazzling new full-color images, and authoritative, up-to-date guidance on usage. Thousands of definitions have been revised in rapidly changing fields such as astronomy and biology. Geographical entries and maps have been completely updated, and the dictionary’s signature feature notes on word history, synonymy, and language variation have all been enhanced and improved.

Word meanings are now easier to understand with thousands of new quotations from classic and contemporary writers. Etymologies explaining word origins and development have been recreated or revised to reflect the very latest scholarship. Many words are traced back to their roots in prehistory through two unique appendixes, showing word roots in ancient Indo-European and Semitic languages.

This app is tailored to professionals, students, and academics, as well as anyone who needs a comprehensive and authoritative dictionary of current English at work or at home.

 • Learn in style with any of the four colorful new themes – The colorful layout will turn your learning experience into an enjoyable routine. Customize your dictionary and benefit from the cheerful mood your favorite color brings you.
 • Dive right into the intricacies of the language - With new and convenient Home page, sleeker and more intuitive visual layout, as well as innovations in the speed of searches, you can get to the desired entry faster than ever.
 • Translate and learn as you speak by using Talk & Translate – Use the speech recognition & text-to-speech app by downloading it for Free from the App Store. The great synergy between the two apps will be there to help you optimize your studies.

SEARCH TOOLS - quickly find words with the clear, functional, and easy-to-use interface.
Designed to provide the most comprehensive search experience, the dictionary combines several search tools to match or predict what are you looking for, including:
 • Search autocomplete helps you find words quickly by displaying predictions as you type.
 • Keyword lookup allows you to search within compound words and phrases.
 • Camera search looks up words in the camera viewfinder and displays results in seconds.
 • Voice search helps you find an entry when you don’t know how a word is spelled.
Looking for a specific word but don't know how it's spelled? We've got you covered with our automatic ‘Fuzzy filter’ to correct word spelling, as well as ‘Wild card’ ('*' or '?') to replace a letter or entire parts of a word.

LEARNING TOOLS - engaging features that help you further enhance your vocabulary. Designed to give you freedom to structure your studies, the dictionary combines several learning tools to help you be more organized, including:
 • ‘Favorites’ that allow you to create custom folders with lists of words.
 • Recent list which helps you to easily review looked-up words.
 • Swipe-to-delete functionality in the Recent and Favorites menus.
 • Word-of-the-day option to teach you a new word every day.

Feel excited by the new word or definition you just learned? Share your discovery with friends on social media, email or any other option available on your device.

THE AMERICAN HERITAGE® ROGET'S THESAURUS (*available as an In-App Purchase) offers an intelligent and sensible guide to synonym selection. It provides a wide range of synonyms, ranging from mainstream vocabulary to the colorful alternatives that make English such a rich and versatile language. Thousands of slang, informal, and regional words broaden the coverage even further. Each synonym list focuses on a clear definition that quickly guides the user to the relevant meaning.

What’s New

Version 10.0.10

•New vocabulary database (2018 edition).
•Four new colorful themes.
•Delete and sort entries with Favorites/Recent list.

Ratings and Reviews

4.0 out of 5
72 Ratings

72 Ratings

rcobbe ,

Great dictionary, but a couple of UI omissions

I've long appreciated the scholarship that goes into the American Heritage Dictionary. The Usage Panel is a great way to examine the state of the language, though I do think it would be improved by the addition of some good corpus-based linguistics. Having that dictionary available on iOS devices is a great form factor and extremely convenient. (I'm also enough of a language geek to enjoy having the appendices containing Semitic and PIE roots -- fascinating reading!)

The app is generally pretty good, and offline access is great! There is, however, one really unfortunate omission, and this is the main thing preventing me from giving the app 5 stars. It's great to be able to browse the dictionary by tapping on words that appear in definitions--but it's really irritating not to have a "back" button! This is particularly true when I've jumped to another entry by mistake. (Swiping from the left just opens the menu, and I don't see an obvious control for this operation.)

Developer Response ,

Thank you for your detailed feedback. We are always trying to answer all users' requests. Please follow our next releases for updates. In the meanwhile, if you have any questions, please contact us directly at:

WazeSir ,

Will let you see a fraction of the words in the actual dictionary

I have been a huge fan of AHD for a number of decades and downloaded this app, in hopes that it could offer features available in the print edition.
I do like the "Word of the day" feature, when it actually displays the word, but, as it is with the rest of this app, you will not often be able to see either the word or the definition. The app does not proceed to an actual definition when searching for a word; it will simply "suggest" the word it thinks you are wanting to see. There is no functionality beyond that.
This has been a very disappointing app, and especially to a devoted user of AHD, it is only a few steps above worthless. Very sad. I never wanted to consider a competitor's product, but may be forced to do so, including looking elsewhere for a desktop computer version. That product is well beyond worthless, and in fact can do literal damage to your computer (they offer downloads, but numerous disclaimers that protect them from liability, because their downloads are laden with viruses, which they acknowledge). Shame on you, producers of one of the best dictionaries of all time, for creating such poor products. I hope you will once again create a great dictionary, in an electronic version, but I have a distinct feeling that those days are gone.

Developer Response ,

Hello, WazeSir! We are sorry that you are disappointed with the dictionary. Please feel free to contact us at and share your recommendations about the app. Thank you!

AuntLucy69 ,

Misleading and Unethical

I love this app, but it’s reviews here are not credible. Often, when I use the app, an intrusive box pops up demanding that I give the app a five star rating. I suppose to get rid of this intrusion I’m to click and comply. I won’t do it, and so have to work past this dishonest, unethical scheme. I really do like the app - just not the people selling it.

App Privacy

The developer, MobiSystems, Inc., has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


MobiSystems, Inc.
51.9 MB

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


English, Catalan

Age Rating
In-App Purchases
  1. American Heritage English Dictionary + $4.99


  • Family Sharing

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

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