1a change to an opposite direction, position, or course of action:a dramatic reversal in population decline in the Alps [mass noun]:the reversal of tidal currents
Law an annulment of a judgement, sentence, or decree made by a lower court or authority:a reversal by the House of Lords of the Court of Appeal’s decision
an adverse change of fortune:the champions suffered a League reversal at Gloucester last month
2 [mass noun] Photography direct production of a positive image from an exposed film or plate; direct reproduction of a positive or negative image: [as modifier]:a black-and-white reversal kit
