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Most readers on android allow this. Some of the most known: mantano, moon reader, fbreader. These three use another app for dictionary purposes: color dict. Color dict uses dictionaries in the stardic format. You can find free dictionaries for many languages in that format. Inside the reader apps, you just long tap a word and you get a popup with the translation. You can use as many dictionaries simultaneously as you like and color dic also can search wikipedia, if you are currently online.
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