American Heritage® Deluxe 9+

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Enfour, Inc.

    • 4.5 • 30 Ratings
    • $16.99


*NOTE: there is a newer version of American Heritage® Dictionary available on the AppStore. Click 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 & "Roget's II: The New Thesaurus".

• The American Heritage® Dictionary of the English Language
• Roget's II: The New Thesaurus


"In the battle of the Big Three dictionaries, American Heritage® stands out on iPhone" (4 mice)
— MacWorld

Includes all the functionality of these two titles in one application.

This iPhone/iPod touch version has the entire 2,074 page, 7.5 pound dictionary with its nearly 300,000 terms more than 33,000 written examples –plus 64 thousand professionally recorded sound files. Not to mention the complete front matter and appendices, zoomable graphics -all available instantly at your fingertips.

Main Features:
• entire text of these best selling tomes
• complete front matter and appendices
• unique three-way cross-referencing search
• real-time progressive look-up
• wildcard pattern searches (with * ?)
• fallback online search for esoteric or archaic words and the latest slang
• spelling suggestion dictionary included
• hyperlinking to appendices and between books
• pop-up pronunciation symbols chart
• IPA symbol conversion
• etymology (word history) with root links
• professionally recorded sound files
• zoomable graphics
• Bookmarks with folders & editable notations
• automatic search History
• AI boosted anagram generator
• search from other applications via a "Service" menu item
• "Word-of-the-Day" feature with multiple words sets
• DarkMode support
• OS-independent app localization
• iPhone, iPod, iPad and macOS support


"As apps go, only Enfour’s American Heritage® 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

"The American Heritage® Dictionary of the English Language, Fourth Edition" and "Roget’s II: The New Thesaurus, Third Edition" are published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Houghton Mifflin Harcourt Publishing Company

Powered by Enfour's -"UniDict® Engine 15"

What’s New

Version 15.3

Updates to Flashcards and Study Memo.
Changes to "Save Search Word" off behaviour.

Ratings and Reviews

4.5 out of 5
30 Ratings

30 Ratings

Morning time ,

Years of satisfactory answers

I have had this app for years. I use it almost on a daily basis. I cannot recollect a single time where I have not been completely satisfied with the definitions I have found. This is truly a tool for increasing our understanding of the world and I am deeply grateful to the makers of this app.

dapi-dapi ,

Not honest

I bought this years back at a considerable cost (39.9$) and couple of years later they stopped updating in App Store. As a result all the dictionaries by Enfour, of which I actually bought quite a few, stopped working on new iOS. Then they would start selling the same title at a higher price. So, as a verified buyer, before you decide to buy, think twice. BTW, they do have a tech support: it’s one man shop I guess.
just received an answer from the developer claiming they have regularly updated their products. I pulled back one of the titles I bought Rogets II Thesaurus, and as of now it requires an update which is not available unless you buy it again @$6.99. ( I wish I could upload the screenshot to this rating) My American Heritage deluxe version stopped working at least 3years ago due to its lack of update and ergo incompatibility with the new iOS.
So i stand by my claim and urge buyers be aware of Enfour products: they are expensive, they don’t update forcing you to buy a new version and yes, their tech support is one man show at least in the past few years.

Developer Response ,

This app has been updated regularly for over 10 years. Just look at the version history. More than 20 updates in the past two years alone. Our apps have never been far behind any OS update.
We are definitely not a one-man shop.
Please do not mislead our customers.

swtbby ,

My go to Dictionary.

A few years back the developers had made a decision to stop supporting and updating this app, meaning eventually an update to the iSO would kill it. I don’t know how many people pushed back, I know I did. Hats off and thanks to the developers for re-thinking that decision.

Developer Response ,

We never stopped supporting it. Updates were slow for a while -due to issues beyond our control. They are coming thick and fast now.

App Privacy

The developer, Enfour, Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Location
  • User Content
  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

More By This Developer

American Heritage Dictionary 5
American Heritage® Dictionary
Roget's II: New Thesaurus
Companion Synonyms
Companion Thesaurus

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