What is the meaning of reversal?

noun

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