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 amp; -ive
Origin of retroactiveFrench rétroactif, from Latin retroactus, past participle of retroagere, to drive back : retr&omacron;-, retro- + agere, to drive; see ag- in Indo-European roots.
retroactive - Legal Definition