retroactive

/ˌrɛtroʊˈæktɪv/
adjective
  1. Taking effect from a date in the past rather than from the present or future.
    • The scholarship was awarded retroactively, so she received money for the previous semester.
    • A retroactive law can be controversial because it punishes people for actions that were legal when committed.
    • The retroactive pay raise covered the last six months of work.
Antonyms
What does "retroactive" mean? | whatsthatwordmean | whatsthatwordmean