retroaction
/ˌrɛtroʊˈækʃən/
noun
- The act or process of taking effect from a past date; backward action or influence.
- The retroaction of the new rules meant that some people had to pay extra taxes for last year.
- Historians study the retroaction of earlier events on later developments.
- The retroaction of the medication was unexpected, affecting symptoms that had appeared weeks before.
Synonyms