reversal

(noun) a change from one state to the opposite state. Examples: "There was a reversal of autonomic function."

(noun) an unfortunate happening that hinders or impedes; something that is thwarting or frustrating. Synonyms: reverse, setback, blow, black eye.

(noun) turning in an opposite direction or position. Synonyms: turn around. Examples: "The reversal of the image in the lens."

(noun) a decision to reverse an earlier decision. Synonyms: change of mind, flip-flop, turnabout, turnaround.

(noun) a judgment by a higher court that the judgment of a lower court was incorrect and should be set aside.

(noun) turning in the opposite direction. Synonyms: reversion, reverse, turnabout, turnaround.

(noun) the act of reversing the order or place of. Synonyms: transposition.

(noun) a major change in attitude or principle or point of view. Synonyms: about-face, volte-face, policy change. Examples: "An about-face on foreign policy."