Definition of "Reversal" :
noun: a major change in attitude or principle or point of view
noun: a change from one state to the opposite state
"There was a reversal of autonomic function."
noun: the act of reversing the order or place of
noun: turning in the opposite direction
noun: a judgment by a higher court that the judgment of a lower court was incorrect and should be set aside
noun: a decision to reverse an earlier decision
noun: turning in an opposite direction or position
"The reversal of the image in the lens."
noun: an unfortunate happening that hinders or impedes; something that is thwarting or frustrating