Cambridge Advanced Learner's Dictionary 8.30.75

It comes to your PDA (Palm OS) more than just a dictionary. You will learn English from the beginning to the highest level.

Cambridge Advanced Learner's Dictionary abandons the schemes of a traditional digital dictionary, it goes beyond a compilation of all existing, and approved, English vocabulary to date. Thousands of phrases and comments, in the form of notes, to make learning easier for people with a basic level of English, as well as tips for correcting common mistakes when learning English. But, for the more advanced, it will not be a dictionary that is too small for them, more than 170,000 complex expressions, different meanings, idioms, and thousands of other resources.

As far as digital is concerned, its simple interface and filter when searching for words will give you no reason to complain.