1. Support multiple dictionaries at once, dictionaries of the user's choice are installed separately. There are plenty of dictionary files available for download at http://stardict.sourceforge.net/Dictionaries.php It includes other foreign language dictionary such as English to Chinese, French to Chinese, English to French etc. It also contains dictionaries that explains words in specific area such as science, medical, computer etc.
2. Scan mode that allow easy lookup. By default scan mode is enabled. With scan mode, to check for meaning, user can double click on a word or highlight the words. Stardict will pop up a context menu with all the results.
3. Stardict allow fuzzy query. With Fuzzy Query, user allow to enter the query word with wildcards. Stardict will list all the available words which meets the query with wildcards. This allow users search for the word even he do not know the correct spelling.
There are other's features yet to discover. With these features, stardict is worth install package.