1.ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)
2.heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together
1.direct one's attention on something;
Please focus on your studies and not on your hobbies
2.fasten with a rivet or rivets
3.hold (someone's attention);
The discovery of the skull riveted the paleontologists