This app has never worked as well since it was released for iOS 9.
Still has no sound. Pronunciation feature was a strong point of the app. Developer promised a fix in November, 2015, but none yet.
Jan. 12, 2016
Just completed downloading the latest semi-annual update.
This dictionary is still the best on contemporary American English usage, and has the advantage of being available in an iOS app that functions flawlessly and is filled with features.
1-17-2015
This is probably the best dictionary available on contemporary American English language usage. And certainly the best on contemporary usage that is available in an iOS app.
Its great that the publisher does complete semi-annual updates, with new words being added.
Also, they do a good job with occasional updates, when Apple periodically tweaks iOS, or other issues crop up. 10-2-2014