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retribution
retrieval
retrieve
retriever
retro
retro-
retro-engine
retroact
retroaction
retroactive
retroactive inhibition
retrocede
retrochoir
retrofire
retrofit
retroflection
retroflex
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retroaction

ret·ro·ac·tion [ rèttrō ákshən ] (plural ret·ro·ac·tions)


noun 
Definition:
 
1. applicability to past: the applicability of something to past circumstances or events

2. action reacting to past situation: an action that responds or reacts to something in the past

3. counteraction: an action that goes against or balances a previous action

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