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@Hitch: I've unpacked several free Word Wise enabled Kindle books. Since I didn't find any definition markup in those files, I strongly suspect that Amazon simply licensed a large English thesaurus database that eInk Kindles use to add definitions on-the-fly. However, since not all new Kindle books are automatically Word Wise enabled, this feature seems to be artificially restricted to certain books. (Maybe they have to pay a small per book license fee to the thesaurus provider or eInk Kindles can only display Word Wise definitions on-the-fly, if the style sheet of the Kindle book meets certain requirements.)
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