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Adjective: retroactive  `retrow'aktiv
  1. Descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously
     
  2. Affecting things past
    "retroactive tax increase"
    - ex post facto, retro

See also: retroactively, retrospective

Antonym: proactive

Encyclopedia: Retroactive

Nearest

retributive
retributory
retrievable
retrieval
retrieve
retriever
retro
retro-
retroact
retroaction
retroactive
retroactively
retrobulbar neuritis
retrocede
retrocession
retrochoir
retrofit
retroflection
retroflex
retroflexed
retroflexion