reversal

noun

1. a change from one state to the opposite state"there was a reversal of autonomic function"
2. an unfortunate happening that hinders or impedes; something that is thwarting or frustrating
3. turning in an opposite direction or position"the reversal of the image in the lens"
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"an about-face on foreign policy"