uSage is a free EPUB reader for Android that turns any book into a vocabulary lesson. Tap any word to see what it means in that exact sentence, with a translation in Urdu, Hindi, Arabic and 8 more languages. Save the words worth keeping, and they come back in a short daily review until they stick. Import your own EPUBs or start with free classics. Works offline, with no ads. Try the demo in your browser at u-sage.com.