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Noun: retroaction  `retrow'akshun
  1. Operation on something past or preceding
     
  2. Action returned, or action backward

Derived forms: retroactions

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