Noun

1. A change from one state to the opposite state
2. An unfortunate happening that hinders or impedes; something that is thwarting or frustrating
3. Turning in an opposite direction or position
4. A decision to reverse an earlier decision
5. A judgment by a higher court that the judgment of a lower court was incorrect and should be set aside
6. Turning in the opposite direction
7. The act of reversing the order or place of
8. A major change in attitude or principle or point of view