I suppose that simply reading a dictionary a bunch would be rather draining, so that is a very good point.
I do quite like that double vision idea. I think that would be best, though you are right that it would take considerable time to implement. The picture book is also not a bad idea; I admittedly didn't realize that it was actually defining words being used in conversation while I played, so that's on me. I'll probably want to explore the game again with that being kept in mind.
Thank you for the reply!