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 4.3.2

Fix for a couple of odd-ball states that could result in sync stalling.

Ratings and Reviews

4.2 out of 5
38 Ratings

38 Ratings

TuesdayOS ,


Really appreciate this application. It’s extremely complex in a good way. Answers everything and more

ec1v ,

Adverts, when I’ve already paid in full

I bought this at full price. It was clean and worked well. But now it has adverts and you have to pay for a pro upgrade. How is this not a bait and switch ?
When other devs do this they have the courtesy of grand fathering in the early, paying customers.
It’s actually not even about the money - it’s the principal.

randomelements ,

Now even better

As a blogger I've found Terminology to be an extremely useful aide, not least because of the close integration with Drafts. My only complaint was the interface. Now, in version 4, the look has been completely revamped and the addition of a share extension makes it easier to use from even more places. A must for anyone who writes anything on their device.


Agile Tortoise
84.6 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Rated 4+
© 2010-2019 by Agile Tortoise, Inc.
In-App Purchases
  1. Pro £1.99


  • Family Sharing

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

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