1. noun /ˈɪntɹɛst,ˈɪntɹəst,ˈɪntəɹəst/
a) The price paid for obtaining, or price received for providing, money or goods in a credit transaction, calculated as a fraction of the amount or value of what was borrowed.
Our bank offers borrowers an annual interest of 5%.
He has a lot of interest in vintage cars.
2. verb /ˈɪntɹɛst,ˈɪntɹəst,ˈɪntəɹəst/
It might interest you to learn that others have already tried that approach.
Wikipedia foundation.