Many free and paid dictionary applications are available in web. Here is the list of best downloads based on availability, feature set, addons, etc

1) Wordweb

Small footprint, free version,Full Audio pronunciations, ease of use, online support, auto pop feature, portable version is available.

Download WordWeb 6 for Windows 2000/XP/Vista/Windows 7

2) Mobysaurus

Dictionary
It’s much more comprehensive than the thesaurus in WordWeb.

3) Lingoes

Lingoes is one of the advance dictionaries available. It is available for free unlike WordWeb Pro. Multiple dictionaries, language support or translation that can be installed (the best feature of Lingoes).

dictionary

Moreover Wikipedia dictionary can be added. Lot more feature to try. Best choice for professionals.

Portable version.

          
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