Look it up instantly without leaving your page
Smart Lookup integrates entries from The New Oxford American Dictionary with information from X-Ray and Wikipedia, so you can access definitions, characters, settings, and more without losing your place.
Read more challenging books
Word Wise makes it easier to enjoy and quickly understand more challenging books. Short and simple definitions automatically appear above difficult words, so you can keep reading with fewer interruptions. Tap on a word to bring up a simple card with definitions, synonyms, and more. Available on many popular English language titles.
Build your vocabulary
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.
Pick up where you left off
Whispersync technology synchronizes your last page read, bookmarks, and annotations across all your devices so you can pick up exactly where you left off reading.
Learn more about a book before you start reading
With About This Book, see background information about the author, other books in the series, and more.
Adjust your text size
Choose from eight text sizes to prevent tired eyes and keep you reading longer.
Share your library
With Family Library, you and your family can access and easily share not only your own Kindle books, but also books from the linked Amazon account of a spouse or partner.