QuickDic

Android offline dictionary

Uses data from Wiktionary and Beolingus to generate dictionary files that can be used offline. These can be downloaded from within the app.
This is an Android app converted with ARC Welder from the F-Droid APK, thus it depends on the "App Runtime for Chrome" which may be a significant download if you do not yet have it.

Note: While it works well for me, this application and its dictionaries have not been updated for a while. If you have the time and inclination to maintain it consider looking at the source (https://code.google.com/p/quickdic-dictionary/) and contacting the original developer.

Note2: This converted app runs fine for me on e.g. Linux, that it is only available on ChromeOS is Google's decision, not mine.