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American Heritage English Dictionary & Thesaurus

By MobiSystems, Inc.

This app is only available on the App Store for iOS devices.


This software bundles the American Heritage® Dictionary of the English Language and the Roget’s Thesaurus in one complete language app. It's the perfect solution to use at school, in the office, or at home!

Exhaustively researched and thoroughly revised, the Fifth Edition of THE AMERICAN HERITAGE® DICTIONARY OF THE ENGLISH LANGUAGE 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 made easier to understand with thousands of new quotations from classic and contemporary writers. Etymologies explaining word origins and development have been newly created 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.

THE AMERICAN HERITAGE® ROGET'S THESAURUS 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 orients the user to the relevant meaning.

Also includes advanced search and language tools that have become the staple of quality language apps from MobiSystems.

SEARCH TOOLS – effortlessly find words using a clear, functional, and easy-to-use interface. The integrated search tools activate automatically the moment you start typing:
* Search autocomplete helps find words quickly by displaying predictions as you type
* Keyword lookup allows you to search within compound words and phrases
* An automatic ‘Fuzzy filter’ to correct word spelling, as well as ‘Wild card’ ('*' or '?') to replace a letter or entire parts of a word
* Camera search automatically searches for words in the camera viewfinder and displays results

LEARNING TOOLS – engaging features that help you further enhance your vocabulary:
* ‘Favorites’ feature to create custom folders with lists of words from the extensive library
* ‘Recent’ list to help you easily review looked-up words
* ‘Word of the day’ section to help expand your vocabulary every day

If you have any questions, feedback or suggestions please contact us directly at

What's New in Version 8.5.7

* Voice Search - speak to enter your searches quicker (iOS 10 only), also includes Voice Search Shortcut for all devices with 3D touch technology;
* Voice Over - hear the word definition of your entries (iOS 8, 9 & 10);
* Updated database - compressed data files for faster reference;
* Updated audio - new and clear records of the pronunciation.


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Customer Reviews

Intentional app rating scheme is unforgivable

This is about the sixth time I've bought the American Heritage dictionary as a book, a paperback, 30 floppy discs, a book with an app on CD, an iOS app, and now the newer iOS app since the previous version "aged out." Sadly, I bought it a few days after iOS 10 — and it won't run. I hope its fixed soon so I can concentrate on having a high quality, offline, robustly featured dictionary of authority at my fingertips.

Update: The app was updated to run in iOS 10, allowing me to use it and to discover an unforgivable characteristic of the app. Nearly every time I go to use it, a pop up appears over the screen; it gives you two options: rate the app five stars, or choose "not yet." In other words, it presents a situation where you can give the app the highest possible review, or no review at that moment — meaning that you'll be asked this question over and over again. I assume the only way to turn this irritating thing off is to rate the app five stars. It doesn't deserve five stars — for this one "feature" alone, it deserves zero stars. Shame on Houghton Mifflin, the dictionary's publisher, for allowing MobiSystem, Inc. to denigrate their reputable dictionary with such a cheap ploy in a premium-priced app.

Frustrating Flaws in App Implementation

Like many others who have commented, I'm a longtime fan of the AH Dictionary, and have had to purchase it numerous times, at considerable expense, as it has migrated from app to app. Like others, I'm very annoyed by the repeated request to rate the app with 5 stars, which is absolutely ridiculous for a responsible software maker. The bigger problem, though, is that while traveling in Europe recently I discovered that the app refused to open if I wasn't logged on to the Internet...which defeats the whole purpose of carrying an offline dictionary on one's phone. PLEASE allow this app to work even when one is connected to the Internet!!! This is a HUGE bug that truly needs fixing.


It is certainly useful for those who are simply looking for an American heritage dictionary. As an app, it's features are lacking. For example, an older version (around iOS 5) allowed quizzes with your bookmarks and games. Design wise, there are two different buttons for audio playback? Unless I'm missing something there. Would like to see some more features for a $20 app. Though having the American heritage dictionary in your pocket is great. I haven't experienced any crashes on iOS 9.

American Heritage English Dictionary & Thesaurus
View in iTunes
This app is designed for both iPhone and iPad
  • $19.99
  • Category: Reference
  • Updated:
  • Version: 8.5.7
  • Size: 30.4 MB
  • Languages: English, Catalan
  • Seller:

Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

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