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retroactive (adj.)

of powers, enactments, etc., "operating with respect to past circumstances, extending to matters which have occurred, holding good for preceding eases," from French rétroactif (16c.) "casting or relating back," from Latin retroact-, past-participle stem of retroagere "drive or turn back," from retro "back" (see retro-) + agere "to drive, set in motion" (from PIE root *ag- "to drive, draw out or forth, move"). Related: Retroactively; retroactivity.

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Definitions of retroactive from WordNet

retroactive (adj.)
descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously;
retroactive (adj.)
affecting things past;
retroactive tax increase
Synonyms: ex post facto / retro
From wordnet.princeton.edu