What is retroactive definition?

Retroactive definition refers to a definition or interpretation that is applied to events or actions that occurred before the definition was established. It means that a law, rule, or definition is put into effect with an earlier effective date than when it was actually created. This can be controversial as it can change the rules after the fact and affect the outcome of decisions made in the past. Retroactive definitions can be used in legal cases, tax laws, and other areas where clarity is needed on how to apply regulations from the past to current situations. However, the use of retroactive definition also raises ethical concerns and can be challenged in court.