Tatiana Ballo has Dictionary 25in1 (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for FREE (regularly $9.99) for a limited time.

Pocket Dictionary 20in1 is a collection of America’s leading and most-trusted explicative dictionaries for learning and word discovery! It features more than 300000 words, advanced search to explore the word’s meaning in all the dictionaries at one time, audio pronunciations of the unknown words and their meanings, offline usage support, and much more.