There's something about that question that doesn't make sense. Overdrive is a book source. The dictionary for my device is independent of that source; it is the same dictionary for all books regardless of their source. So I'm not sure overdrive is relevant.
Now, I use a nook, so maybe it is different for other systems. On a nook, you're stuck with the dictionary nook provides. I suppose you could root the OS and substitute in a dictionary of choice but I gave up on the root idea when I realized it would cut into my nap time.
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