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