Terminology is a browser for the English language – part dictionary, part thesaurus and part research tool. Terminology makes it easy to explore words and phrases, diving down to more and less specific terms - accessing the web and other apps for more detail and sharing.

More than a dictionary, Terminology can be extended with custom actions to search the Internet and other reference apps – making it a great place to start all your searches.

Use the share extension to select text anywhere, in any app, and look it up in Terminology.

### Dictionary, Thesaurus & Search

- Offline U.S. English dictionary and word reference with simple clear definitions.
- Definitions, synonyms, antonyms and deeper word relations such as: more and less specific words, part, part of, members, member of, pertains to and more.
- Favorite terms.
- Word browsing history.
- Add your own notes to any term.
- Audio pronunications.
- Wildcard (?,*) searching.
- Spelling suggestions.
- Fast, reliable, iCloud (CloudKit) sync and backup of history, favorites, notes and actions.
- Term of the day.

### Extensible Actions

Actions provide quick links to lookup and search your terms on websites and in other apps. Ready to use actions for popular reference sites like Wikipedia,, Google, IMDb, Snopes and more, or create your own with simple URL templates.

### All the Latest Technologies

- Share extension lets you access Terminology from a text selection in any app.
- Today widget for quick access.
- 3D Touch support.
- iPad Multitasking/Split View support.
- Spotlight and Handoff support.

### More Features

- Extensive support for URL scheme integration via x-callback-url. Visit our website for details.
- Great support for Accessibility features like VoiceOver and Dynamic Text.

### About the Dictionary

- Terminology's offline dictionary is based on the latest 3.1 version of the Princeton University WordNet project and contains U.S. English words.


We love to hear your feedback, please contact us.

Twitter/ @terminologyapp

What's New

Version 4.1.4

A few quick fixes...

- **Change:** Do not lowercase suggestion for typed query.
- **Fix:** Issues with word lists scrolling to the top of the list, particularly after deletions.
- **Fix:** Issue new order not being saved properly when reordering actions in the action list.
- **Fix:** Crashing issue on iOS 10.

Detailed notes on our blog,
Help & Support:
News and Tips: @terminologyapp on Facebook and Twitter

Review and ratings are always appreciated!

Ratings and Reviews

4 out of 5

6 Ratings

6 Ratings

Changes the way I write on iPad


With iOS 11, Terminology comes into it’s own. On an iPad Pro I have it side by side with my writing app and look up words as I go, or have it as a third window off screen that I slide into view when needed. Very nice.

This app is the beginning of something great. It’s annoying, though, that it takes two presses to start a new search from a previous search. That baffles me, everything else is so well thought out. It’s worrying that the developer misses that. Otherwise, awesome.

I’m looking forward to digging into the extensible options to see what else it can do for me.

In-app ad shakedown


App was a paid ad-free app, developer updated to include in-app advertising that is distasteful and intrusive. Requires in-app purchase to remove advertising. Effecting a shakedown of existing purchasers of their old app in order to force a paid upgrade to a new version is a 🍆 move (Tried to use Terminology to find an appropriately descriptive word here but couldn't bear using it after fourth full screen ad). I'm looking for an alternative paid-app where the developer treats customers better.



Added advertising to the paid app with an update, and charges paid users to remove adds. Very, very dodgy.


Agile Tortoise
103.4 MB
Requires iOS 10.3 or later. Compatible with iPhone, iPad and iPod touch.
Age Rating
Rated 4+
© 2010-2017 by Agile Tortoise, Inc.
In-App Purchases
  1. Pro $4.49


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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