Noun
The state or characteristic of being retroactive.
(law) The application of a law to events that took place before it was made.
Source: en.wiktionary.orgAnd remember, the SARA Act provided for retroactivity, probably one of the first statutes that did so,” Teixeira said the in the letter. Source: Internet
In his opening Statement at the International Military Tribunal, the British Chief Prosecutor Lord Hartley Shawcross stated: "There is thus no substantial retroactivity in the provisions of the Charter. Source: Internet