An example of retroactive is when you are charged fees for service from the start of the month even if you don't sign a contract for the service until the 10th day of the month.
- having application to or effect on things done prior to its enactment: a retroactive law
- going into effect as of a specified date in the past: a retroactive increase
Origin of retroactiveFrench rétroactif: see retroact and -ive
Origin of retroactiveFrench rétroactif from Latin retroāctus past participle of retroagere to drive back retrō- retro- agere to drive ; see ag- in Indo-European roots.
retroactive - Legal Definition