Retroact(v. i.) To act backward, or in return; to act in opposition; to be retrospective.
Retroaction(n.) Action returned, or action backward.
Retroaction(n.) Operation on something past or preceding.
Retroactive(a.) Fitted or designed to retroact; operating by returned action; affecting what is past; retrospective.
Retroactively(adv.) In a retroactive manner.
Words within retroactivities