American Heritage® Dictionary18.0 - App Store

*NOTE: there is a newer version of American Heritage(R) Dictionary available on the AppStore. Tap on the "Enfour, Inc." link for AHD5.

The entire 2,074 page, 7.5 pound dictionary with its nearly 300,000 terms -plus 64 thousand recorded sound files by native speakers -all available instantly at your fingertips.

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"In the battle of the Big Three dictionaries, American Heritage(R) stands out on iPhone" (4 mice)
- MacWorld
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More than 33,000 written examples, totaling 4,222,000 words, makes this largest mobile dictionary on ANY platform
The indexes alone are larger than most brand-name dictionaries. Even without the sound files, AHD would still be the largest dictionary in the AppStore.

Main Features:
● the entire text of this best selling book
● complete front matter and appendices
● three-way cross-referencing search
● real-time progressive look-up
● wildcard pattern searches (with * ?)
● spelling suggestion dictionary included
● internal hyperlinking & supports copy/paste
● pop-up pronunciation symbols chart
● IPA pronunciation symbol conversion
● etymology (word history) with root links
● professionally recorded sound files
● zoomable graphics
● fallback online search for esoteric or archaic words and the latest slang
● unique two-way external application interaction
- first iPhone dictionary with external linking and now most advanced!
● bookmarks with editable notations
● automatic search history
● an "AI Teacher" for deeper explanations or help for ESL students in 98 languages
● AI boosted anagram generator
● "Today" & LockScreen widgets
● 3D Touch support
● DarkMode support
● Siri support
● iPad multi-screen and Drag & Drop
● iPhone 18 & iOS27 support
● iPhone, iPod, iPad and macOS support
● complete offline use - no Internet connection

The renowned American Heritage(R) Usage Panel, a group of more than 200 distinguished writers, scholars, and scientists, offers advice on problems of grammar and style; engaging notes explain word histories and clarify differences among synonyms; thousands of quotations and example sentences show words in context; and elegant definitions are enhanced by numerous full-color photographs, drawings, and maps, making this one of the most complete reference tool available on any mobile platform.

Reviews for the application:

"As apps go, only Enfour’s American Heritage(R) Dictionary stands out for its graphic appeal and functionality. Although I was pleased to have so much lexical firepower in such a compact form, I was annoyed at how poorly the other dictionaries present on the platform." (4 mice)
- MacWorld

Editor's Choice. ranking = "Great"
- MacLife

Reviews of the print version:

"The Best Dictionary...Designed to appeal to the eye as well as the mind, it is notable for its imaginative illustrations....This is a great family dictionary, and ideal for schoolrooms."
- The Courier Journal

"This dictionary, now in its fourth edition, makes it fun to look up definitions of words....This up-to-date and eminently useful dictionary features a fabulous full-color design that quickly and effectively guides users to the information they seek."
- Library Journal

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The American Heritage(R) Dictionary of the English Language, Fourth Edition published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
http://www.hmco.com

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Powered by Enfour's "UniDict(R) Engine 18"

-thesaurus links work with these products:
"Roget's II: New Thesaurus"
"Companion Thesaurus"
"Companion Synonyms"
and many more

Version History Updated Siri support and added Apple Intelligence support (eg. offline AI Teacher on devices that support it)
Fixed an issue with the Bookmarks menu in iOS27. 18.0 2d ago Updates Bookmark sync and backup.
Add support for Anki. 17.0 Jul 14 Improved iOS26 support 16.2 Mar 12 Better support for iOS26 16.1 Feb 24 A fix for search on conjugations. 16.0.2 09/22/2025 Fix for Today Widget 16.0.1 09/07/2025 Bringing up to date 16.0 09/05/2025 Adds an "AI Teacher" for deeper explanations or help for ESL students in 98 languages.
Fixes for Bookmark syncing. 15.5 05/31/2024 Updates to Flashcards and Study Memo.
Changes to "Save Search Word" off behaviour.
Adds launch via Siri. 15.3 03/18/2024 Now add up to 3 Words-of-the-Day.
Add import and restore of Bookmarks from iCloud Drive. 15.1 02/16/2024 Adds an AI boosted anagram generator.
Adds a LockScreen Widget.
iOS17 support. 15.0 11/10/2023 Fixes for Flashcards and Lightning cards 14.7 08/04/2023 Fix for Bookmark folders 14.6 07/20/2023 Adds a Lightning Cards feature that lets you study just a few words in any spare minutes 14.5 06/26/2023 Adds new third-party dictionary links.
Adds a "Open to Search" setting to iPads.
Changes the way it works on iPhones.
Complete update to localizations.
Fixes for Bookmarks. 14.1 03/12/2023 Major update to Bookmarks and History.
• iCloud Sync now works no matter how many bookmarks you have.
• Backups are made locally for all bookmark changes.
• Automatic weekly bookmark backup setting has been added.
• You can also use your bookmarks in the "Today" widget or "Word of the Day".
• You can now bulk save your search History to Bookmarks. 14.0 02/19/2023 Major update to Bookmarks and History.
Bulk save search History to Bookmarks.
You can now use your Bookmarks in the "Today" widget or "Word of the Day". 13.4 01/29/2023 Fix for printing in iOS16 13.3.2 12/23/2022 Fixes for iOS 16 13.3 10/06/2022 Major pronunciation sound upgrade.
Upgraded sound quality from 8bit to 16bit.

Pinching in and out for zooming for definition pages returns. 13.2 03/13/2022 Better iCloud syncing.
Adds a selectable interface for Bookmark restores.
Adds a setting for third-party keyboards. 13.0.1 01/24/2022 UI & graphics updated.
Bookmarks are now automatically restored after the app is deleted and reinstalled. (Turn on iCloud Sync setting for this)
Manual Bookmark iCloud restore is now smarter. 13.0 12/22/2021 Fix to licensing 12.1.5 12/11/2021 Interface updates 12.1.2 12/01/2021 Fixes TabBar layout for some iPhones 12.1.1 11/23/2021