That's one of the features of the new Paperwhite that's due out soon.
From the features page on Amazon.com:
"Enhance Your Vocabulary
NEW—Words looked up in the dictionary are automatically added to Vocabulary Builder to expand your knowledge and reinforce retention. Swipe through your vocabulary words, quiz yourself with flashcards, and instantly see those words in context."
Older Kindle models may get this feature in firmware updates, not sure the Kindle Keyboard will get it, but you could wait a while and see, and just consider upgrading if it doesn't.
Last edited by soulfuldog; 09-19-2013 at 12:47 PM.
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