reversal in WordNet English dictionary

1. a major change in attitude or principle or point of view
   "an about-face on foreign policy"
   about-face  volte-face  reversal  policy change 
   
2. an unfortunate happening that hinders or impedes; something that is thwarting or frustrating
   reverse  reversal  setback  blow  black eye 
   
3. a decision to reverse an earlier decision
   reversal  change of mind  flip-flop  turnabout  turnaround 
   
4. a change from one state to the opposite state
   "there was a reversal of autonomic function"
   reversal 
   
5. the act of reversing the order or place of
   transposition  reversal 
   
6. turning in the opposite direction
   reversion  reverse  reversal  turnabout  turnaround 
   
7. a judgment by a higher court that the judgment of a lower court was incorrect and should be set aside
   reversal 
   
8. turning in an opposite direction or position
   "the reversal of the image in the lens"
   reversal  turn around