I don't know about aldiko's addon dictionary, since I use iReader and Laputa.
But if you want to use a good stand-alone dictionary app, then ColorDict is the best and free app. It has its own dictionary and thesaures. Second, it can read "StarDict" format. So I have added following free dictionaries downloaded from stardict website:
1. Merrium Webster Colligiate
2. Britannica.com's
3. Britannica concise
4. Drug reference (I study pharmacology in medical school)
5. Shahram's medical dictionary
6. and 2-3 others.
When you search a term, it shows definition from all dictionaries and you can set priority which dictionary is up in the line. Secondly, if you are on wifi or connected through a data plan to internet, wikipedia addon for it will also give entries from wikipedia and when clicked, opens whole wikipedia article.
Currently, I am working on Wikipedia's XML databases(6GB compressed, more than 14GB uncompressed) to be converted to Stardict format and also to static HTML. So I can move them to my 16GB SD card and browse the WHOLE ENGLISH WIKIPEDIA FASTER AND OFFLINE!
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