That sounds like a great implementation to me -- so it would be for looking up words run across in the course of reading, and not a general reference where one would simply try to look up words like one does in a paper dictionary.
That should be implementable -- it would require some sort of key-press combination to activate the cursor, then the movement keys to move the highlight from word to word and then another keypress to have the definition show up.
sounds reasonable to me as a reading aid.
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