There are two pro versions, one paid and one supported by ADS. This is the paid version with no ADS.
The pro versions have extra features compared to the basic free version: search web dictionaries, voice search, random word widget, 10,000+ more definitions and sample sentences where available.
It is designed to be easy to use and give you the top and most common results for your query. All you need to do is start typing to get results instantly. By default the more probable matches are displayed first although there is an option to display results purely alphabetically too.
The dictionary also supports pronunciations for definitions, a favourites feature, word hyperlinking, sharing and customisation options.
If you have any questions, suggestions or feature requests please email me using the contact option in the Android Market. Unfortunately I cannot respond personally to comments in the market.
tags: off-line, offline, english dictionary.