I voted Don't care. I have no use for this feature and am not even certain what a book dictionary would consist of.
OTOH, I think that such a dictionary would be a very difficult item to create. Are you planning on giving most words in an ePub file links to a footnote that displays a definition of the word? Inflections are going to be a killer. Perhaps loading a mass of dictionaries onto the ereader to allow the user to select that dictionary similar to the Tolkien, WoT and Cosmere dictionaries? Not sure what the naming would look like since a Kobo wants a valid 2 character language code unless you want to see dicthtml-tolkien.zip
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