Reversal
WordNet
noun
(1) A major change in attitude or principle or point of view
"An about-face on foreign policy"
(2) A change from one state to the opposite state
"There was a reversal of autonomic function"
(3) The act of reversing the order or place of
(4) Turning in the opposite direction
(5) A judgment by a higher court that the judgment of a lower court was incorrect and should be set aside
(6) A decision to reverse an earlier decision
(7) Turning in an opposite direction or position
"The reversal of the image in the lens"
(8) An unfortunate happening that hinders or impedes; something that is thwarting or frustrating