Collins English Dictionary/Thesaurus (Universal) $39.99 => Free

[Habakuk]

I'm not the developer. Just passing the info. Store link:

https://itunes.apple.com/app/collins-english-dictionary/id368184280?mt=8

The Collins English Dictionary 2011 Complete & Unabridged and the Collins Thesaurus of the English Language 2011 in a software bundle offering a complete language and reference solution for writing, for work, for study, because you want to express yourself well, or just for the love of words.

* Search over 500,000 English words, references and examples in this 30th anniversary edition of the Collins’ flagship dictionary.
* Let the Thesaurus help you find that tantalizing solution to tricky language clues with over 377,000 synonyms and antonyms.

The price of the Universal app is constant since 2011. Free for the first time (and for a limited time obviously)!